diff --git a/addons/stock_dropshipping/stock_dropshipping.py b/addons/stock_dropshipping/stock_dropshipping.py
index cbd079263ca..2fe37ea8565 100644
--- a/addons/stock_dropshipping/stock_dropshipping.py
+++ b/addons/stock_dropshipping/stock_dropshipping.py
@@ -6,16 +6,17 @@ from openerp import models, api
 class sale_order_line(models.Model):
     _inherit = 'sale.order.line'
 
-    @api.one
+    @api.multi
     def _check_routing(self, product, warehouse):
         """ skip stock verification if the route goes from supplier to customer
             As the product never goes in stock, no need to verify it's availibility
         """
         res = super(sale_order_line, self)._check_routing(product, warehouse)
         if not res:
-            for pull_rule in self.route_id.pull_ids:
-                if (pull_rule.picking_type_id.default_location_src_id.usage == 'supplier' and
-                        pull_rule.picking_type_id.default_location_dest_id.usage == 'customer'):
-                    res = True
-                    break
+            for line in self:
+                for pull_rule in line.route_id.pull_ids:
+                    if (pull_rule.picking_type_id.default_location_src_id.usage == 'supplier' and
+                            pull_rule.picking_type_id.default_location_dest_id.usage == 'customer'):
+                        res = True
+                        break
         return res