diff --git a/addons/web/static/src/js/framework/session.js b/addons/web/static/src/js/framework/session.js
index 18fccecc331..6af97721926 100644
--- a/addons/web/static/src/js/framework/session.js
+++ b/addons/web/static/src/js/framework/session.js
@@ -141,9 +141,12 @@ var Session = core.Class.extend(mixins.EventDispatcherMixin, {
         }
         var def = this._groups_def[group];
         if (!def) {
-            var Model = window.openerp.web.Model;
-            var Users = new Model('res.users');
-            def = this._groups_def[group] = Users.call('has_group', [group]);
+            def = this._groups_def[group] = this.rpc('/web/dataset/call_kw/res.users/has_group', {
+                "model": "res.users",
+                "method": "has_group",
+                "args": [group],
+                "kwargs": {}
+            });
         }
         return def;
     },
diff --git a/addons/web/static/src/js/views/form_relational_widgets.js b/addons/web/static/src/js/views/form_relational_widgets.js
index 00640696b41..d6b61f2313e 100644
--- a/addons/web/static/src/js/views/form_relational_widgets.js
+++ b/addons/web/static/src/js/views/form_relational_widgets.js
@@ -7,6 +7,7 @@ var data = require('web.data');
 var Dialog = require('web.Dialog');
 var common = require('web.form_common');
 var ListView = require('web.ListView');
+require('web.ListEditor'); // one must be sure that the include of ListView are done (for eg: add start_edition methods)
 var Model = require('web.DataModel');
 var session = require('web.session');
 var utils = require('web.utils');