diff -r 5c84c6df6798 -r 2c95e3033f64 server/hooks.py
--- a/server/hooks.py	Wed Dec 02 18:36:16 2009 +0100
+++ b/server/hooks.py	Thu Dec 03 09:55:18 2009 +0100
@@ -11,7 +11,7 @@
 from datetime import datetime
 
 from cubicweb import UnknownProperty, ValidationError, BadConnectionId
-from cubicweb.schema import RQLVocabularyConstraint
+from cubicweb.schema import RQLConstraint, RQLUniqueConstraint
 from cubicweb.server.pool import Operation, LateOperation, PreCommitOperation
 from cubicweb.server.hookhelper import (check_internal_entity,
                                         get_user_sessions, rproperty)
@@ -236,6 +236,7 @@
         return
     constraints = rproperty(session, rtype, eidfrom, eidto, 'constraints')
     if constraints:
+        # XXX get only RQL[Unique]Constraints?
         CheckConstraintsOperation(session, constraints=constraints,
                                   rdef=(eidfrom, rtype, eidto))
 
@@ -254,6 +255,7 @@
                 msg = session._('the value "%s" is already used, use another one')
                 raise ValidationError(entity.eid, {attr: msg % val})
 
+
 def cstrcheck_after_update_attributes(session, entity):
     if session.is_super_session:
         return
@@ -261,7 +263,7 @@
     for attr in entity.edited_attributes:
         if schema.rschema(attr).final:
             constraints = [c for c in entity.e_schema.constraints(attr)
-                           if isinstance(c, RQLVocabularyConstraint)]
+                           if isinstance(c, (RQLConstraint, RQLUniqueConstraint))]
             if constraints:
                 CheckConstraintsOperation(session, rdef=(entity.eid, attr, None),
                                           constraints=constraints)