diff --git a/addons/crm/crm_lead.py b/addons/crm/crm_lead.py
index 12c1b62a50a..75af5fdf223 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -767,10 +767,12 @@ class crm_lead(base_stage, format_address, osv.osv):
         """
         #TODO this is a duplication of the handle_partner_assignation method of crm_phonecall
         partner_ids = {}
+        # If a partner_id is given, force this partner for all elements
+        force_partner_id = partner_id
         for lead in self.browse(cr, uid, ids, context=context):
             # If the action is set to 'create' and no partner_id is set, create a new one
-            if action == 'create' and not partner_id:
-                partner_id = self._create_lead_partner(cr, uid, lead, context)
+            if action == 'create':
+                partner_id = force_partner_id or self._create_lead_partner(cr, uid, lead, context)
             self._lead_set_partner(cr, uid, lead, partner_id, context=context)
             partner_ids[lead.id] = partner_id
         return partner_ids
diff --git a/addons/crm/crm_phonecall.py b/addons/crm/crm_phonecall.py
index 17b696b1795..fccfa96b61e 100644
--- a/addons/crm/crm_phonecall.py
+++ b/addons/crm/crm_phonecall.py
@@ -183,10 +183,12 @@ class crm_phonecall(base_state, osv.osv):
         """
         #TODO this is a duplication of the handle_partner_assignation method of crm_lead
         partner_ids = {}
+        # If a partner_id is given, force this partner for all elements
+        force_partner_id = partner_id
         for call in self.browse(cr, uid, ids, context=context):
             # If the action is set to 'create' and no partner_id is set, create a new one
-            if action == 'create' and not partner_id:
-                partner_id = self._call_create_partner(cr, uid, call, context)
+            if action == 'create':
+                partner_id = force_partner_id or self._call_create_partner(cr, uid, call, context=context)
                 self._call_create_partner_address(cr, uid, call, partner_id, context=context)
             self._call_set_partner(cr, uid, [call.id], partner_id, context=context)
             partner_ids[call.id] = partner_id