diff --git a/purchase_request.py b/purchase_request.py
index 33edd87de0..66090b61f3 100644
--- a/purchase_request.py
+++ b/purchase_request.py
@@ -161,8 +161,8 @@ class PurchaseRequest:
         for request in requests:
             pline = request.purchase_line
             # Skip incoherent request
-            if request.product.id != pline.product.id or \
-                    request.warehouse.id != pline.purchase.warehouse.id:
+            if (request.product != pline.product
+                    or request.warehouse != pline.purchase.warehouse):
                 continue
             # Take smallest amount between request and purchase line
             pline_qty = Uom.compute_qty(pline.unit, pline.quantity,