Open orders are versionable

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@43186 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/OpenOrder.py

@@ -62,6 +62,7 @@ class OpenOrder(Supply):
                     , PropertySheet.Comment
                     , PropertySheet.Arrow
                     , PropertySheet.Order
+                    , PropertySheet.Version
                     )
 
   # Expandable Interface Implementation