diff -r 1ee631aedf2f -r 48e54aabcd55 schemas/base.py
--- a/schemas/base.py	Fri Jul 24 16:09:29 2015 +0200
+++ b/schemas/base.py	Tue Sep 29 14:23:57 2015 +0200
@@ -165,7 +165,6 @@
     cardinality = '11'
     subject = '*'
     object = 'String'
-    constraints = [UniqueConstraint()]
 
 
 # XXX find a better relation name