diff -r 7b0cd6e024e2 -r 1e6536afa855 server/repository.py
--- a/server/repository.py	Tue Mar 23 17:05:05 2010 +0100
+++ b/server/repository.py	Tue Mar 23 17:06:05 2010 +0100
@@ -975,7 +975,11 @@
         # init edited_attributes before calling before_add_entity hooks
         entity._is_saved = False # entity has an eid but is not yet saved
         entity.edited_attributes = set(entity)
-        entity = entity.pre_add_hook()
+        entity_ = entity.pre_add_hook()
+        # XXX kill that transmutation feature !
+        if not entity_ is entity:
+            entity.__class__ = entity_.__class__
+            entity.__dict__.update(entity_.__dict__)
         eschema = entity.e_schema
         etype = str(eschema)
         source = self.locate_etype_source(etype)