Revert misunderstood change.

obj._propertyMap() will put property twice in list if it is local property and
it is defined in property sheets.

product/ERP5Type/Constraint/PropertyTypeValidity.py

@@ -94,7 +94,7 @@ class PropertyTypeValidity(Constraint):
       if fixit and \
          property_id in [x['id'] for x in
              getattr(obj, '_local_properties', ())] and \
-         len([x for x in obj._propertyMap() if x['id'] == property_id]) > 0:
+         len([x for x in obj._propertyMap() if x['id'] == property_id]) > 1:
         obj._local_properties = tuple([x for x in obj._local_properties
                                        if x['id'] != property_id])
         error_list.append(self._generateError(obj,