diff --git a/addons/crm/crm_caldav_view.xml b/addons/crm/crm_caldav_view.xml
index a68970c3bf5..b519f173479 100644
--- a/addons/crm/crm_caldav_view.xml
+++ b/addons/crm/crm_caldav_view.xml
@@ -101,7 +101,10 @@
 <!--            			<separator string="Freebusy Value" colspan="4"/>-->
 <!--            			<field name="freebusy" colspan="4" nolabel="1"/>-->
 <!--            			<separator string="Recurrency Details" colspan="4"/>-->
-            			<group string="Recurrency Details" col="4" colspan="4">
+            			<group string="Recurrency Details" col="5" colspan="4">
+            				<button string="Change RRule"
+            					name="%(caldav.action_view_caldav_set_rrule_wizard)d"
+            					icon="gtk-save-as" type="action" colspan="4"/>
             				<group col="1" colspan="2">
             					<separator string="Recurrenet Rule" />
             					<field name="rrule" nolabel="1" />
diff --git a/addons/crm/crm_caldav_wizard.xml b/addons/crm/crm_caldav_wizard.xml
index 6e72b13a217..472f90fcdb3 100644
--- a/addons/crm/crm_caldav_wizard.xml
+++ b/addons/crm/crm_caldav_wizard.xml
@@ -8,5 +8,9 @@
 			id="wizard_crm_cal_export" multi="True"
 		/>
 		
+		<wizard string="Set RRULE" model="crm.case"
+			name="caldav.set.rrule" id="wizard_crm_set_rrule"
+		/>
+		
 	</data>
 </openerp>
diff --git a/addons/crm/crm_calendar.py b/addons/crm/crm_calendar.py
index ad2979abcf2..ba0a4ead6c2 100644
--- a/addons/crm/crm_calendar.py
+++ b/addons/crm/crm_calendar.py
@@ -110,7 +110,7 @@ class crm_case(osv.osv):
                  of date/time exceptions for arecurring calendar component."), 
         'exrule' : fields.text('Exception Rule', help="defines a rule or repeating pattern\
                                  for anexception to a recurrence set"), 
-        'rrule' : fields.text('Recurrent Rule'), 
+        'rrule' : fields.text('Recurrent Rule', readonly=True), 
         'rdates' : fields.function(_get_rdates, method=True, string='Recurrent Dates', \
                                    store=True, type='text'), 
        'attendees': fields.many2many('crm.caldav.attendee', 'crm_attendee_rel', 'case_id', \
@@ -214,7 +214,7 @@ class crm_case(osv.osv):
                 limit, order, context, count)
         return res
 
-    def write(self, cr, uid, ids, vals, context=None):
+    def write(self, cr, uid, ids, vals, context=None, check=True, update_check=True):
         new_ids = []
         for id in ids:
             id = common.caldevIDs2readIDs(id)