--- a/cubicweb/hooks/syncsession.py	Thu Feb 11 21:59:49 2016 +0100
+++ b/cubicweb/hooks/syncsession.py	Wed Feb 17 13:45:34 2016 +0100
@@ -148,7 +148,8 @@
         """the observed connections set has been commited"""
         cwprop = self.cwprop
         if not cwprop.for_user:
-            self.cnx.vreg['propertyvalues'][cwprop.pkey] = cwprop.value
+            self.cnx.vreg['propertyvalues'][cwprop.pkey] = \
+                self.cnx.vreg.typed_value(cwprop.pkey, cwprop.value)
         # if for_user is set, update is handled by a ChangeCWPropertyOp operation