--- a/hooks/syncschema.py	Fri Feb 18 09:33:32 2011 +0100
+++ b/hooks/syncschema.py	Fri Feb 18 16:30:02 2011 +0100
@@ -1127,7 +1127,7 @@
 class AfterAddCWUniqueTogetherConstraintHook(SyncSchemaHook):
     __regid__ = 'syncadd_cwuniquetogether_constraint'
     __select__ = SyncSchemaHook.__select__ & is_instance('CWUniqueTogetherConstraint')
-    events = ('after_add_entity', 'after_update_entity')
+    events = ('after_add_entity',)
 
     def __call__(self):
         CWUniqueTogetherConstraintAddOp(self._cw, entity=self.entity)