diff --git a/product/ERP5/Document/PredicateGroup.py b/product/ERP5/Document/PredicateGroup.py
index c39df5d6e6daecd5fabda6a7f0a565d01b3beeee..7d6c79c13686cf49170f5f7dcb4664cea5a4f29c 100755
--- a/product/ERP5/Document/PredicateGroup.py
+++ b/product/ERP5/Document/PredicateGroup.py
@@ -171,7 +171,7 @@ identify a bank account."""
     """
       The title of a predicate is its operator representations
     """
-    return getattr(self, 'title', self.predicate_operator)
+    return getattr(self, 'title', self.getPredicateOperator())
 
 
   security.declareProtected( Permissions.AccessContentsInformation, 'getCriterionList' )