diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 22a033cd2f5..60c1ac51397 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -1330,7 +1330,7 @@ class account_invoice(osv.Model):
         else:
             user_id = uid
         po_ids = purchase_order_obj.search(cr, user_id, [('invoice_ids', 'in', ids)], context=context)
-        for order in purchase_order_obj.browse(cr, uid, po_ids, context=context):
+        for order in purchase_order_obj.browse(cr, user_id, po_ids, context=context):
             purchase_order_obj.message_post(cr, user_id, order.id, body=_("Invoice received"), context=context)
             invoiced = []
             shipped = True
@@ -1343,8 +1343,8 @@ class account_invoice(osv.Model):
                 if all(line.invoice_id.state not in ['draft', 'cancel'] for line in po_line.invoice_lines):
                     invoiced.append(po_line.id)
             if invoiced and shipped:
-                self.pool['purchase.order.line'].write(cr, uid, invoiced, {'invoiced': True})
-            workflow.trg_write(uid, 'purchase.order', order.id, cr)
+                self.pool['purchase.order.line'].write(cr, user_id, invoiced, {'invoiced': True})
+            workflow.trg_write(user_id, 'purchase.order', order.id, cr)
         return res
 
     def confirm_paid(self, cr, uid, ids, context=None):