Add Reference property sheet.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@37100 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/RoundingModel.py

@@ -48,6 +48,7 @@ class RoundingModel(Predicate):
                      PropertySheet.DublinCore,
                      PropertySheet.Predicate,
                      PropertySheet.SortIndex,
+                     PropertySheet.Reference,
                      PropertySheet.RoundingModel,
                      )