diff --git a/addons/base_calendar/base_calendar.py b/addons/base_calendar/base_calendar.py
index 301780282e7..3ad3b3db5b0 100644
--- a/addons/base_calendar/base_calendar.py
+++ b/addons/base_calendar/base_calendar.py
@@ -410,6 +410,8 @@ property or property parameter."),
             return res
         cal = vobject.iCalendar()
         event = cal.add('vevent')
+        if not event_obj.date_deadline or not event_obj.date:
+              raise osv.except_osv(_('Warning !'),_("Couldn't Invite because date is not specified!"))     
         event.add('created').value = ics_datetime(time.strftime('%Y-%m-%d %H:%M:%S'))
         event.add('dtstart').value = ics_datetime(event_obj.date)
         event.add('dtend').value = ics_datetime(event_obj.date_deadline)
@@ -461,7 +463,6 @@ property or property parameter."),
             attendee_add.params['ROLE'] = [str(attendee.role)]
             attendee_add.params['RSVP'] = [str(attendee.rsvp)]
             attendee_add.value = 'MAILTO:' + (attendee.email or '')
-            
         res = cal.serialize()
         return res
 
diff --git a/addons/base_calendar/base_calendar_view.xml b/addons/base_calendar/base_calendar_view.xml
index 6fcb8f72f82..d536ef02824 100644
--- a/addons/base_calendar/base_calendar_view.xml
+++ b/addons/base_calendar/base_calendar_view.xml
@@ -77,6 +77,7 @@
                 <tree string="Invitation details">
                     <field name="sent_by_uid" string="Invitation From" />
                     <field name="role" string="My Role"/>
+                    <field name="user_id" invisible="1"/>
                     <field name="cutype" string="Invitation type"/>
                     <field name="state" />
                     <field name="rsvp" string="Required to Join"/>
diff --git a/addons/crm/wizard/crm_opportunity_to_phonecall.py b/addons/crm/wizard/crm_opportunity_to_phonecall.py
index 0b68d7f37ba..8fc7ffb310d 100644
--- a/addons/crm/wizard/crm_opportunity_to_phonecall.py
+++ b/addons/crm/wizard/crm_opportunity_to_phonecall.py
@@ -137,7 +137,7 @@ class crm_opportunity2phonecall(osv.osv_memory):
                 'view_mode': 'tree,form',
                 'res_model': 'crm.phonecall',
                 'res_id' : new_case,
-                'views': [(id3, 'form'), (id2, 'tree'), (False, 'calendar'), (False, 'graph')],
+                'views': [(id3, 'form'), (id2, 'tree'), (False, 'calendar')],
                 'type': 'ir.actions.act_window',
                 'search_view_id': res['res_id']
             }