removed useless import

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2478 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/InvoiceRule.py

@@ -29,7 +29,6 @@
 from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions, PropertySheet, Constraint, Interface
 from Products.ERP5.Document.Rule import Rule
-from Products.ERP5.MovementGroup import CategoryMovementGroup
 
 from zLOG import LOG