diff --git a/addons/crm/res_partner.py b/addons/crm/res_partner.py
index 31c45969f8e..55cc0c95b2c 100644
--- a/addons/crm/res_partner.py
+++ b/addons/crm/res_partner.py
@@ -82,7 +82,7 @@ class res_partner(osv.osv):
                 'planned_revenue' : planned_revenue,
                 'probability' : probability,
                 'partner_id' : partner_id,
-                'categ_id' : categ_ids and categ_ids[0] or '',
+                'categ_ids' : categ_ids and categ_ids[0:1] or [],
                 'state' :'draft',
                 'type': 'opportunity'
             }, context=context)
diff --git a/addons/crm/wizard/crm_opportunity_to_phonecall.py b/addons/crm/wizard/crm_opportunity_to_phonecall.py
index 873dd6ab36e..92996d2e7eb 100644
--- a/addons/crm/wizard/crm_opportunity_to_phonecall.py
+++ b/addons/crm/wizard/crm_opportunity_to_phonecall.py
@@ -71,7 +71,7 @@ class crm_opportunity2phonecall(osv.osv_memory):
         call_ids = opportunity.schedule_phonecall(cr, uid, opportunity_ids, data.date, data.name, \
                 data.note, data.phone, data.contact_name, data.user_id and data.user_id.id or False, \
                 data.section_id and data.section_id.id or False, \
-                data.categ_id and data.categ_id.id or False, \
+                data.categ_ids and data.categ_ids[0].id or False, \
                 action=data.action, context=context)
         return {'type': 'ir.actions.act_window_close'}