diff -r c83a8ecb9bf5 -r 5308b3fe03c9 server/sources/native.py
--- a/server/sources/native.py	Mon Jun 17 00:15:51 2013 +0200
+++ b/server/sources/native.py	Wed Jan 22 10:19:30 2014 +0100
@@ -468,9 +468,6 @@
         # can't claim not supporting a relation
         return True #not rtype == 'content_for'
 
-    def may_cross_relation(self, rtype):
-        return True
-
     def authenticate(self, session, login, **kwargs):
         """return CWUser eid for the given login and other authentication
         information found in kwargs, else raise `AuthenticationError`