fix yaml test by writing route_ids using python instead of record

stock_reserve_sale/test/sale_line_reserve.yml

@@ -60,11 +60,18 @@
     product = self.browse(cr, uid, ref('product_yogurt'), context=context)
     assert product.virtual_available == 6, "Stock is not updated."
 -
-  I set product_12 to MTO
+  I set product_12 to MTO (doesn't work)
 -
   !record {model: product.product, id: product.product_product_12}:
     route_ids:
       - stock.route_warehouse0_mto
+-
+  I set MTO for real
+-
+  !python {model: product.product}: |
+    product = self.browse(cr, uid, ref('product.product_product_12'), context=context)
+    self.write(cr, uid, ref('product.product_product_12'),
+               {'route_ids': [(6, False, [ref('stock.route_warehouse0_mto')])]}, context=context)
 -
   And I create a MTO sales order line
 -