diff --git a/product/ERP5/Document/PredicateGroup.py b/product/ERP5/Document/PredicateGroup.py
index e20529008295df91e3591686443cb3db26bcef83..2d93f01e4f103e51f64eeba41bcfd33699c55a88 100755
--- a/product/ERP5/Document/PredicateGroup.py
+++ b/product/ERP5/Document/PredicateGroup.py
@@ -46,6 +46,7 @@ class PredicateGroup(Folder, Predicate):
   add_permission = Permissions.AddPortalContent
   isPortalContent = 1
   isRADContent = 1
+  is_predicate = 1
 
   _operators = (
     {