add a missing import.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31665 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/mixin/rule.py

@@ -31,6 +31,7 @@ from AccessControl import ClassSecurityInfo
 from Acquisition import aq_base
 from Products.CMFCore.utils import getToolByName
 from Products.ERP5Type import Permissions, interfaces
+from Products.ERP5.Document.Predicate import Predicate
 
 def _compare(tester_list, prevision_movement, decision_movement):
   for tester in tester_list: