Added XXX comment

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@10050 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/Preference.py

@@ -29,6 +29,8 @@
 class Preference:
   """
     User Preference PropertySheet
+
+    XXX: why is this here and not in ERP5Form ?
   """
   
   _properties = (