diff -r d8de1ac21f36 -r 432f87a63057 cubicweb/sobjects/services.py
--- a/cubicweb/sobjects/services.py	Wed Oct 05 15:28:43 2016 +0200
+++ b/cubicweb/sobjects/services.py	Fri Sep 30 18:25:08 2016 +0200
@@ -21,9 +21,6 @@
 
 from six import text_type
 
-from yams.schema import role_name
-
-from cubicweb import ValidationError
 from cubicweb.server import Service
 from cubicweb.predicates import match_user_groups, match_kwargs