diff --git a/product/ERP5Workflow/Document/Interaction.py b/product/ERP5Workflow/Document/Interaction.py
index 89cadb306bb6e3e2d9fdde4b3ce8c77d85ec457c..f34c9f34161a626fdb939b4633197876227b3e30 100644
--- a/product/ERP5Workflow/Document/Interaction.py
+++ b/product/ERP5Workflow/Document/Interaction.py
@@ -40,7 +40,7 @@ from zLOG import LOG, INFO, ERROR, WARNING
 from Products.DCWorkflow.Expression import StateChangeInfo
 from Products.ERP5Type.id_as_reference import IdAsReferenceMixin
 
-class Interaction(IdAsReferenceMixin('_interaction'), XMLObject):
+class Interaction(IdAsReferenceMixin('interaction_', "prefix"), XMLObject):
   """
   An ERP5 Interaction.
   """