diff --git a/product/ERP5/bootstrap/erp5_core/ActionTemplateItem/portal_types/Content%20Existence%20Constraint/predicate.xml b/product/ERP5/bootstrap/erp5_core/ActionTemplateItem/portal_types/Content%20Existence%20Constraint/predicate.xml
new file mode 100644
index 0000000000000000000000000000000000000000..784dbba036d46d802380d27799f0f40557e8620b
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/ActionTemplateItem/portal_types/Content%20Existence%20Constraint/predicate.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ActionInformation" module="Products.CMFCore.ActionInformation"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_local_properties</string> </key>
+            <value>
+              <tuple>
+                <dictionary>
+                  <item>
+                      <key> <string>id</string> </key>
+                      <value> <string>is_indexable</string> </value>
+                  </item>
+                  <item>
+                      <key> <string>type</string> </key>
+                      <value> <string>string</string> </value>
+                  </item>
+                </dictionary>
+                <dictionary>
+                  <item>
+                      <key> <string>id</string> </key>
+                      <value> <string>reindex_kw</string> </value>
+                  </item>
+                  <item>
+                      <key> <string>type</string> </key>
+                      <value> <string>string</string> </value>
+                  </item>
+                </dictionary>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>action</string> </key>
+            <value>
+              <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+            </value>
+        </item>
+        <item>
+            <key> <string>categories</string> </key>
+            <value>
+              <tuple>
+                <string>action_type/object_view</string>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>category</string> </key>
+            <value> <string>object_view</string> </value>
+        </item>
+        <item>
+            <key> <string>condition</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>description</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>icon</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>predicate</string> </value>
+        </item>
+        <item>
+            <key> <string>is_indexable</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>permissions</string> </key>
+            <value>
+              <tuple>
+                <string>View</string>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>portal_type</string> </key>
+            <value> <string>Action Information</string> </value>
+        </item>
+        <item>
+            <key> <string>priority</string> </key>
+            <value> <float>2.0</float> </value>
+        </item>
+        <item>
+            <key> <string>reindex_kw</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>title</string> </key>
+            <value> <string>Predicate</string> </value>
+        </item>
+        <item>
+            <key> <string>visible</string> </key>
+            <value> <int>1</int> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="2" aka="AAAAAAAAAAI=">
+    <pickle>
+      <global name="Expression" module="Products.CMFCore.Expression"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>text</string> </key>
+            <value> <string>string:${object_url}/Predicate_view</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/ActionTemplateItem/portal_types/Content%20Existence%20Constraint/view.xml b/product/ERP5/bootstrap/erp5_core/ActionTemplateItem/portal_types/Content%20Existence%20Constraint/view.xml
new file mode 100644
index 0000000000000000000000000000000000000000..3ea2278cfff93506a7f300fc9127b400389ab5b5
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/ActionTemplateItem/portal_types/Content%20Existence%20Constraint/view.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ActionInformation" module="Products.CMFCore.ActionInformation"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_local_properties</string> </key>
+            <value>
+              <tuple>
+                <dictionary>
+                  <item>
+                      <key> <string>id</string> </key>
+                      <value> <string>is_indexable</string> </value>
+                  </item>
+                  <item>
+                      <key> <string>type</string> </key>
+                      <value> <string>string</string> </value>
+                  </item>
+                </dictionary>
+                <dictionary>
+                  <item>
+                      <key> <string>id</string> </key>
+                      <value> <string>reindex_kw</string> </value>
+                  </item>
+                  <item>
+                      <key> <string>type</string> </key>
+                      <value> <string>string</string> </value>
+                  </item>
+                </dictionary>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>action</string> </key>
+            <value>
+              <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+            </value>
+        </item>
+        <item>
+            <key> <string>categories</string> </key>
+            <value>
+              <tuple>
+                <string>action_type/object_view</string>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>category</string> </key>
+            <value> <string>object_view</string> </value>
+        </item>
+        <item>
+            <key> <string>condition</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>description</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>icon</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>view</string> </value>
+        </item>
+        <item>
+            <key> <string>is_indexable</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>permissions</string> </key>
+            <value>
+              <tuple>
+                <string>View</string>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>portal_type</string> </key>
+            <value> <string>Action Information</string> </value>
+        </item>
+        <item>
+            <key> <string>priority</string> </key>
+            <value> <float>1.0</float> </value>
+        </item>
+        <item>
+            <key> <string>reindex_kw</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>title</string> </key>
+            <value> <string>View</string> </value>
+        </item>
+        <item>
+            <key> <string>visible</string> </key>
+            <value> <int>1</int> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="2" aka="AAAAAAAAAAI=">
+    <pickle>
+      <global name="Expression" module="Products.CMFCore.Expression"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>text</string> </key>
+            <value> <string>string:${object_url}/ContentExistenceConstraint_view</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/PortalTypeAllowedContentTypeTemplateItem/allowed_content_types.xml b/product/ERP5/bootstrap/erp5_core/PortalTypeAllowedContentTypeTemplateItem/allowed_content_types.xml
index 715c4be3cf0115aa971c84b71c11932af383d7b7..ed967ad1ce68fa67e020c7f23d6145481e0250fe 100644
--- a/product/ERP5/bootstrap/erp5_core/PortalTypeAllowedContentTypeTemplateItem/allowed_content_types.xml
+++ b/product/ERP5/bootstrap/erp5_core/PortalTypeAllowedContentTypeTemplateItem/allowed_content_types.xml
@@ -57,6 +57,7 @@
   <item>Attribute Equality Constraint</item>
   <item>Category Existence Constraint</item>
   <item>Category Property</item>
+  <item>Content Existence Constraint</item>
   <item>Dynamic Category Property</item>
   <item>Property Existence Constraint</item>
   <item>Standard Property</item>
diff --git a/product/ERP5/bootstrap/erp5_core/PortalTypeTemplateItem/portal_types/Content%20Existence%20Constraint.xml b/product/ERP5/bootstrap/erp5_core/PortalTypeTemplateItem/portal_types/Content%20Existence%20Constraint.xml
new file mode 100644
index 0000000000000000000000000000000000000000..172012df2b9c491311874f621f8b59984a4c904e
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/PortalTypeTemplateItem/portal_types/Content%20Existence%20Constraint.xml
@@ -0,0 +1,111 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="Base Type" module="erp5.portal_type"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_property_domain_dict</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>short_title</string> </key>
+                    <value>
+                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+                    </value>
+                </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value>
+                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
+                    </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>content_icon</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>description</string> </key>
+            <value> <string>A Content Existence Constraint checks whether an object has at least one subobject of the optionally specified Portal Types</string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>Content Existence Constraint</string> </value>
+        </item>
+        <item>
+            <key> <string>init_script</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>permission</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>portal_type</string> </key>
+            <value> <string>Base Type</string> </value>
+        </item>
+        <item>
+            <key> <string>type_class</string> </key>
+            <value> <string>ContentExistenceConstraint</string> </value>
+        </item>
+        <item>
+            <key> <string>type_interface</string> </key>
+            <value>
+              <tuple/>
+            </value>
+        </item>
+        <item>
+            <key> <string>type_mixin</string> </key>
+            <value>
+              <tuple/>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="2" aka="AAAAAAAAAAI=">
+    <pickle>
+      <global name="TranslationInformation" module="Products.ERP5Type.TranslationProviderBase"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>domain_name</string> </key>
+            <value> <string>erp5_content</string> </value>
+        </item>
+        <item>
+            <key> <string>property_name</string> </key>
+            <value> <string>short_title</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="3" aka="AAAAAAAAAAM=">
+    <pickle>
+      <global name="TranslationInformation" module="Products.ERP5Type.TranslationProviderBase"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>domain_name</string> </key>
+            <value> <string>erp5_content</string> </value>
+        </item>
+        <item>
+            <key> <string>property_name</string> </key>
+            <value> <string>title</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/PortalTypeWorkflowChainTemplateItem/workflow_chain_type.xml b/product/ERP5/bootstrap/erp5_core/PortalTypeWorkflowChainTemplateItem/workflow_chain_type.xml
index df9b6200bc3a4e8f14fe12bdb59a7ed293f19a1a..b9c3974561e5d85ad16b7b6124e3ad467427b9c4 100644
--- a/product/ERP5/bootstrap/erp5_core/PortalTypeWorkflowChainTemplateItem/workflow_chain_type.xml
+++ b/product/ERP5/bootstrap/erp5_core/PortalTypeWorkflowChainTemplateItem/workflow_chain_type.xml
@@ -39,6 +39,10 @@
   <type>Category Tool</type>
   <workflow>dynamic_class_generation_interaction_workflow</workflow>
  </chain>
+ <chain>
+  <type>Content Existence Constraint</type>
+  <workflow>dynamic_class_generation_interaction_workflow</workflow>
+ </chain>
  <chain>
   <type>Distributed Ram Cache</type>
   <workflow>distributed_ram_cache_interaction_workflow</workflow>
diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view.xml
new file mode 100644
index 0000000000000000000000000000000000000000..8bfc8a3fd523ddd4f0a0b8c5567532899ffb68a4
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view.xml
@@ -0,0 +1,159 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ERP5Form" module="Products.ERP5Form.Form"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_bind_names</string> </key>
+            <value>
+              <object>
+                <klass>
+                  <global name="NameAssignments" module="Shared.DC.Scripts.Bindings"/>
+                </klass>
+                <tuple/>
+                <state>
+                  <dictionary>
+                    <item>
+                        <key> <string>_asgns</string> </key>
+                        <value>
+                          <dictionary/>
+                        </value>
+                    </item>
+                  </dictionary>
+                </state>
+              </object>
+            </value>
+        </item>
+        <item>
+            <key> <string>_objects</string> </key>
+            <value>
+              <tuple/>
+            </value>
+        </item>
+        <item>
+            <key> <string>action</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>description</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>edit_order</string> </key>
+            <value>
+              <list/>
+            </value>
+        </item>
+        <item>
+            <key> <string>encoding</string> </key>
+            <value> <string>UTF-8</string> </value>
+        </item>
+        <item>
+            <key> <string>enctype</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>group_list</string> </key>
+            <value>
+              <list>
+                <string>left</string>
+                <string>right</string>
+                <string>center</string>
+                <string>bottom</string>
+                <string>hidden</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>groups</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>bottom</string> </key>
+                    <value>
+                      <list/>
+                    </value>
+                </item>
+                <item>
+                    <key> <string>center</string> </key>
+                    <value>
+                      <list>
+                        <string>my_description</string>
+                      </list>
+                    </value>
+                </item>
+                <item>
+                    <key> <string>hidden</string> </key>
+                    <value>
+                      <list/>
+                    </value>
+                </item>
+                <item>
+                    <key> <string>left</string> </key>
+                    <value>
+                      <list>
+                        <string>my_id</string>
+                        <string>my_reference</string>
+                        <string>my_constraint_portal_type</string>
+                      </list>
+                    </value>
+                </item>
+                <item>
+                    <key> <string>right</string> </key>
+                    <value>
+                      <list>
+                        <string>my_message_no_subobject</string>
+                        <string>my_message_no_subobject_portal_type</string>
+                      </list>
+                    </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>ContentExistenceConstraint_view</string> </value>
+        </item>
+        <item>
+            <key> <string>method</string> </key>
+            <value> <string>POST</string> </value>
+        </item>
+        <item>
+            <key> <string>name</string> </key>
+            <value> <string>ContentExistenceConstraint_view</string> </value>
+        </item>
+        <item>
+            <key> <string>pt</string> </key>
+            <value> <string>form_view</string> </value>
+        </item>
+        <item>
+            <key> <string>row_length</string> </key>
+            <value> <int>4</int> </value>
+        </item>
+        <item>
+            <key> <string>stored_encoding</string> </key>
+            <value> <string>UTF-8</string> </value>
+        </item>
+        <item>
+            <key> <string>title</string> </key>
+            <value> <string>Content Existence Constraint</string> </value>
+        </item>
+        <item>
+            <key> <string>unicode_mode</string> </key>
+            <value> <int>0</int> </value>
+        </item>
+        <item>
+            <key> <string>update_action</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>update_action_title</string> </key>
+            <value> <string></string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_constraint_portal_type.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_constraint_portal_type.xml
new file mode 100644
index 0000000000000000000000000000000000000000..81be612b367bf1d0e92a5c3617858b1c481da66d
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_constraint_portal_type.xml
@@ -0,0 +1,101 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ProxyField" module="Products.ERP5Form.ProxyField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>delegated_list</string> </key>
+            <value>
+              <list>
+                <string>display_width</string>
+                <string>title</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>my_constraint_portal_type</string> </value>
+        </item>
+        <item>
+            <key> <string>message_values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>external_validator_failed</string> </key>
+                    <value> <string>The input failed the external validator.</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>overrides</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>tales</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>display_width</string> </key>
+                    <value> <int>20</int> </value>
+                </item>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string>my_string_field</string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string>Base_viewFieldLibrary</string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string>Click to edit the target</string> </value>
+                </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string>Constraint Portal Types</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_description.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_description.xml
new file mode 100644
index 0000000000000000000000000000000000000000..f5a0120b5aee355ed32ddde1ffd45c32ef4d4a63
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_description.xml
@@ -0,0 +1,96 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ProxyField" module="Products.ERP5Form.ProxyField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>delegated_list</string> </key>
+            <value>
+              <list>
+                <string>width</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>my_description</string> </value>
+        </item>
+        <item>
+            <key> <string>message_values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>external_validator_failed</string> </key>
+                    <value> <string>The input failed the external validator.</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>overrides</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>tales</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string>my_description</string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string>Base_viewFieldLibrary</string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string>Click to edit the target</string> </value>
+                </item>
+                <item>
+                    <key> <string>width</string> </key>
+                    <value> <int>40</int> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_id.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_id.xml
new file mode 100644
index 0000000000000000000000000000000000000000..c6baa37309c09a8074a338f0b883492fe817f887
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_id.xml
@@ -0,0 +1,101 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ProxyField" module="Products.ERP5Form.ProxyField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>delegated_list</string> </key>
+            <value>
+              <list>
+                <string>display_width</string>
+                <string>title</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>my_id</string> </value>
+        </item>
+        <item>
+            <key> <string>message_values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>external_validator_failed</string> </key>
+                    <value> <string>The input failed the external validator.</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>overrides</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>tales</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>display_width</string> </key>
+                    <value> <int>20</int> </value>
+                </item>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string>my_string_field</string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string>Base_viewFieldLibrary</string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string>Click to edit the target</string> </value>
+                </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string>ID</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_message_no_subobject.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_message_no_subobject.xml
new file mode 100644
index 0000000000000000000000000000000000000000..974c8efd9946e409ed1567faadaa5b03d320a540
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_message_no_subobject.xml
@@ -0,0 +1,101 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ProxyField" module="Products.ERP5Form.ProxyField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>delegated_list</string> </key>
+            <value>
+              <list>
+                <string>display_width</string>
+                <string>title</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>my_message_no_subobject</string> </value>
+        </item>
+        <item>
+            <key> <string>message_values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>external_validator_failed</string> </key>
+                    <value> <string>The input failed the external validator.</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>overrides</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>tales</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>display_width</string> </key>
+                    <value> <int>20</int> </value>
+                </item>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string>my_string_field</string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string>Base_viewFieldLibrary</string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string>Click to edit the target</string> </value>
+                </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string>Error message when there is no subobject</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_message_no_subobject_portal_type.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_message_no_subobject_portal_type.xml
new file mode 100644
index 0000000000000000000000000000000000000000..53c941c9e49b24641e046b525f3474d0df7ac07f
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_message_no_subobject_portal_type.xml
@@ -0,0 +1,101 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ProxyField" module="Products.ERP5Form.ProxyField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>delegated_list</string> </key>
+            <value>
+              <list>
+                <string>display_width</string>
+                <string>title</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>my_message_no_subobject_portal_type</string> </value>
+        </item>
+        <item>
+            <key> <string>message_values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>external_validator_failed</string> </key>
+                    <value> <string>The input failed the external validator.</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>overrides</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>tales</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>display_width</string> </key>
+                    <value> <int>20</int> </value>
+                </item>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string>my_string_field</string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string>Base_viewFieldLibrary</string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string>Click to edit the target</string> </value>
+                </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string>Error message when there is no subobject of the given portal type</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_reference.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_reference.xml
new file mode 100644
index 0000000000000000000000000000000000000000..fcf6a920e912b4202a9694b1742b73865379b97d
--- /dev/null
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ContentExistenceConstraint_view/my_reference.xml
@@ -0,0 +1,101 @@
+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="ProxyField" module="Products.ERP5Form.ProxyField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>delegated_list</string> </key>
+            <value>
+              <list>
+                <string>display_width</string>
+                <string>title</string>
+              </list>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>my_reference</string> </value>
+        </item>
+        <item>
+            <key> <string>message_values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>external_validator_failed</string> </key>
+                    <value> <string>The input failed the external validator.</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>overrides</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>tales</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string></string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string></string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+        <item>
+            <key> <string>values</string> </key>
+            <value>
+              <dictionary>
+                <item>
+                    <key> <string>display_width</string> </key>
+                    <value> <int>20</int> </value>
+                </item>
+                <item>
+                    <key> <string>field_id</string> </key>
+                    <value> <string>my_string_field</string> </value>
+                </item>
+                <item>
+                    <key> <string>form_id</string> </key>
+                    <value> <string>Base_viewFieldLibrary</string> </value>
+                </item>
+                <item>
+                    <key> <string>target</string> </key>
+                    <value> <string>Click to edit the target</string> </value>
+                </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string>Name</string> </value>
+                </item>
+              </dictionary>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>
diff --git a/product/ERP5/bootstrap/erp5_core/WorkflowTemplateItem/portal_workflow/dynamic_class_generation_interaction_workflow/interactions/ChangeProperty_resetDynamicClasses.xml b/product/ERP5/bootstrap/erp5_core/WorkflowTemplateItem/portal_workflow/dynamic_class_generation_interaction_workflow/interactions/ChangeProperty_resetDynamicClasses.xml
index e104cbd035f3423893c967cdf038839e5d2c8bd9..b1e1e4ef773f54eabc4f72c75e8e4855dcf173f8 100644
--- a/product/ERP5/bootstrap/erp5_core/WorkflowTemplateItem/portal_workflow/dynamic_class_generation_interaction_workflow/interactions/ChangeProperty_resetDynamicClasses.xml
+++ b/product/ERP5/bootstrap/erp5_core/WorkflowTemplateItem/portal_workflow/dynamic_class_generation_interaction_workflow/interactions/ChangeProperty_resetDynamicClasses.xml
@@ -73,6 +73,7 @@
                 <string>Base Category</string>
                 <string>Category Existence Constraint</string>
                 <string>Category Property</string>
+                <string>Content Existence Constraint</string>
                 <string>Dynamic Category Property</string>
                 <string>Property Existence Constraint</string>
                 <string>Standard Property</string>
diff --git a/product/ERP5/bootstrap/erp5_core/bt/change_log b/product/ERP5/bootstrap/erp5_core/bt/change_log
index d1477e0f0be5e98962ccd77a0613d2b821bff0a3..9f48e5543407a4010668aa9e27e52a64a021d06c 100644
--- a/product/ERP5/bootstrap/erp5_core/bt/change_log
+++ b/product/ERP5/bootstrap/erp5_core/bt/change_log
@@ -1,3 +1,6 @@
+2010-11-26 arnaud.fontaine
+* Add Content Existence Constraint portal type and its views.
+
 2010-11-25 arnaud.fontaine
 * Reset the dynamic documents at the end of the transaction.
 * Merge BaseCategory_resetDynamicClasses into ChangeProperty_resetDynamicClasses.
diff --git a/product/ERP5/bootstrap/erp5_core/bt/revision b/product/ERP5/bootstrap/erp5_core/bt/revision
index 91917fa8810e3b41a2b31862bf3bf5fca928cbb8..2974009fd3610ead1e61c1cd20f510a934dd6f91 100644
--- a/product/ERP5/bootstrap/erp5_core/bt/revision
+++ b/product/ERP5/bootstrap/erp5_core/bt/revision
@@ -1 +1 @@
-1799
\ No newline at end of file
+1800
\ No newline at end of file
diff --git a/product/ERP5/bootstrap/erp5_core/bt/template_action_path_list b/product/ERP5/bootstrap/erp5_core/bt/template_action_path_list
index 498daa383846e4333c2aa49179d7b18c4a6ec227..ad2b093348cd487836e364d812943fbf1ebfc64e 100644
--- a/product/ERP5/bootstrap/erp5_core/bt/template_action_path_list
+++ b/product/ERP5/bootstrap/erp5_core/bt/template_action_path_list
@@ -44,6 +44,8 @@ Category | view
 Class Tool | run_live_test
 Class Tool | view
 Conceptual Id Generator | view
+Content Existence Constraint | predicate
+Content Existence Constraint | view
 Contribution Predicate | view
 Contribution Registry Tool | view
 Distributed Ram Cache | view
diff --git a/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_allowed_content_type_list b/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_allowed_content_type_list
index e01fcbd6a0368fe111addbdc3242a113afc70733..38a5f1a57623cd2eb676b9a43f462a6d7603a55e 100644
--- a/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_allowed_content_type_list
+++ b/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_allowed_content_type_list
@@ -26,6 +26,7 @@ Property Sheet | Acquired Property
 Property Sheet | Attribute Equality Constraint
 Property Sheet | Category Existence Constraint
 Property Sheet | Category Property
+Property Sheet | Content Existence Constraint
 Property Sheet | Dynamic Category Property
 Property Sheet | Property Existence Constraint
 Property Sheet | Standard Property
diff --git a/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_id_list b/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_id_list
index a692e29fce77290683478c064e4fac7db5838f07..ad6298960783d49b4d4a24072233ad470ec61317 100644
--- a/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_id_list
+++ b/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_id_list
@@ -17,6 +17,7 @@ Category Property
 Category Tool
 Class Tool
 Conceptual Id Generator
+Content Existence Constraint
 Contribution Predicate
 Contribution Registry Tool
 Distributed Ram Cache
diff --git a/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_workflow_chain_list b/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_workflow_chain_list
index 18aeee4751439558474ccd551f8f280bf26a1b9f..e4dfce944d90c742b9ade1f6ad1797ce56b43db7 100644
--- a/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_workflow_chain_list
+++ b/product/ERP5/bootstrap/erp5_core/bt/template_portal_type_workflow_chain_list
@@ -10,6 +10,7 @@ Category Existence Constraint | dynamic_class_generation_interaction_workflow
 Category Property | dynamic_class_generation_interaction_workflow
 Category Tool | dynamic_class_generation_interaction_workflow
 Category | edit_workflow
+Content Existence Constraint | dynamic_class_generation_interaction_workflow
 Distributed Ram Cache | distributed_ram_cache_interaction_workflow
 Document | edit_workflow
 Dynamic Category Property | dynamic_class_generation_interaction_workflow