this code was replacing _identity_criterion with a dict

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44339 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Core/Predicate.py

@@ -451,8 +451,8 @@ class Predicate(XMLObject):
       self._range_criterion = PersistentMapping()
     if 'criterion_property_list' in kwd:
       criterion_property_list = kwd['criterion_property_list']
-      identity_criterion = {}
-      range_criterion = {}
+      identity_criterion = PersistentMapping()
+      range_criterion = PersistentMapping()
       for criterion in self._identity_criterion.iterkeys() :
         if criterion in criterion_property_list :
           identity_criterion[criterion] = self._identity_criterion[criterion]