--- a/schema.py	Thu Jul 23 15:57:15 2009 +0200
+++ b/schema.py	Thu Jul 23 17:15:05 2009 +0200
@@ -793,6 +793,7 @@
 PyFileReader.context['RRQLExpression'] = yobsolete(RRQLExpression)
 
 # workflow extensions #########################################################
+from yams.buildobjs import _add_relation as yams_add_relation
 
 class workflowable_definition(ybo.metadefinition):
     """extends default EntityType's metaclass to add workflow relations