bt5_config: Only add property values after removing the old value

product/ERP5/Document/BusinessManager.py

@@ -798,9 +798,11 @@ class BusinessItem(Implicit, Persistent):
       self.isProperty = True
       relative_url, property_id = self._path.split('#')
       obj = portal.unrestrictedTraverse(relative_url)
-      # XXX: Here, we do deal with different cases such as if the object exists
-      # or not or have the same value or compare states
       prop = self._value
+      # First remove the property from the existing path and keep the default
+      # empty, and update only if the sign is +1
+      obj._delPropValue(prop['name'])
+      if self._sign == 1:
         obj.setProperty(prop['name'], prop['value'], prop['type'])
     else:
       path_list = self._path.split('/')

product/ERP5/Tool/TemplateTool.py

@@ -1842,7 +1842,11 @@ class TemplateTool (BaseTool):
               # Compare new item hash with ZODB
 
               if new_item._sha == obj_sha:
-                # If same hash, do nothing
+                if new_item._sign == -1:
+                  # If the sign is negative, remove the value from the path
+                  new_item.install(installation_process)
+                else:
+                  # If same hash, and +1 sign, do nothing
                   continue
 
               else: