diff --git a/addons/payment/models/payment_acquirer.py b/addons/payment/models/payment_acquirer.py
index 5d65f7fbaff..17139195f2d 100644
--- a/addons/payment/models/payment_acquirer.py
+++ b/addons/payment/models/payment_acquirer.py
@@ -454,7 +454,7 @@ class PaymentTransaction(osv.Model):
     def get_next_reference(self, cr, uid, reference, context=None):
         ref_suffix = 1
         init_ref = reference
-        while self.pool['payment.transaction'].search_count(cr, uid, [('reference', '=', reference)], context=context):
+        while self.pool['payment.transaction'].search_count(cr, openerp.SUPERUSER_ID, [('reference', '=', reference)], context=context):
             reference = init_ref + '-' + str(ref_suffix)
             ref_suffix += 1
         return reference
diff --git a/addons/website_sale/controllers/main.py b/addons/website_sale/controllers/main.py
index 1e82a153509..12498409a92 100644
--- a/addons/website_sale/controllers/main.py
+++ b/addons/website_sale/controllers/main.py
@@ -804,12 +804,11 @@ class website_sale(http.Controller):
         tx = request.website.sale_get_transaction()
         if tx:
             tx_id = tx.id
-            if tx.reference != order.name:
+            if tx.sale_order_id.id != order.id or tx.state in ['error', 'cancel'] or tx.acquirer_id.id != acquirer_id:
                 tx = False
                 tx_id = False
             elif tx.state == 'draft':  # button cliked but no more info -> rewrite on tx or create a new one ?
                 tx.write({
-                    'acquirer_id': acquirer_id,
                     'amount': order.amount_total,
                 })
         if not tx: