diff --git a/product/CMFActivity/ActiveResult.py b/product/CMFActivity/ActiveResult.py
index 9ab3d109365308d5553dc687ab5c52f43f7a9e25..976bd26cf8dfd084058c63a89580cf3956055f8c 100644
--- a/product/CMFActivity/ActiveResult.py
+++ b/product/CMFActivity/ActiveResult.py
@@ -48,6 +48,8 @@ class ActiveResult:
   WARNING =  100
   ERROR   =  200
   PANIC   =  300
+  # getProperty default
+  _MARKER = None
 
   def __init__(self,summary='',severity=INFO,detail='',**kw):
     """
@@ -70,11 +72,11 @@ class ActiveResult:
       del kw['object_path']
     self.__dict__.update(kw)
 
-  def getProperty(self,value):
+  def getProperty(self,value,d=_MARKER,**kw):
     """
     A simple getter
     """
-    return getattr(self,value,None)
+    return getattr(self,value,d)
 
   def getResult(self):
     """
diff --git a/product/ERP5Type/Error.py b/product/ERP5Type/Error.py
index 232fae8259b52127c6ab3294b4eaa3fd7f6cefd8..095b5e3c91bdd3decbdeb46eec3d037e70dbb058 100644
--- a/product/ERP5Type/Error.py
+++ b/product/ERP5Type/Error.py
@@ -43,6 +43,8 @@ class Error:
   WARNING =  100
   ERROR   =  200
   PANIC   =  300
+  # Marker for getProperty
+  _MARKER = None
 
   def __init__(self,summary='',severity=INFO,detail='',**kw):
     """
@@ -65,10 +67,10 @@ class Error:
       del kw['object_path']
     self.__dict__.update(kw)
 
-  def getProperty(self,value):
+  def getProperty(self, key, d=_MARKER, **kw):
     """
     A simple getter
     """
-    return getattr(self,value,None)
+    return getattr(self, value, d)
 
 allow_class(Error)