diff --git a/addons/caldav/caldav_view.xml b/addons/caldav/caldav_view.xml
index 889066bb946..bd5b59dfef0 100644
--- a/addons/caldav/caldav_view.xml
+++ b/addons/caldav/caldav_view.xml
@@ -10,6 +10,8 @@
             	<form string="Atendee details">
             		<notebook colspan="4">
             			<page string="Basic details">
+            				<field name="user_id"/>
+            				<newline/>
             				<field name="cn" select="1" colspan="2" />
             				<field name="partstat" />
             				<field name="cutype" select="1" />
@@ -148,6 +150,5 @@
             <field name="target">new</field>
         </record>
         
-        
     </data>
 </openerp>
diff --git a/addons/caldav/common.py b/addons/caldav/common.py
index 9e172dc452d..f51ac068af0 100644
--- a/addons/caldav/common.py
+++ b/addons/caldav/common.py
@@ -112,10 +112,10 @@ class crm_caldav_attendee(osv.osv):
                                    help="Specify the calendar user that is acting on behalf of the calendar user"), 
             'cn': fields.char('CN', size=124, help="The common or displayable name to be associated with the calendar user"), 
             'dir': fields.char('DIR', size=124, help="Reference to the URI that points to the directory information corresponding to the attendee."), 
-            'language': fields.char('LANGUAGE', size=124, help="To specify the language for text values in a property or property parameter."), 
+            'language': fields.char('LANGUAGE', size=124, help="To specify the language for text values in a property or property parameter."),
+            'user_id': fields.many2one('res.users', 'Responsible'),
                 }
     _defaults = {
-        'cn':  lambda *x: 'MAILTO:', 
         }
     
 crm_caldav_attendee()