diff --git a/purchase_request.py b/purchase_request.py
index bb0c738e8e..3adbbaebe0 100644
--- a/purchase_request.py
+++ b/purchase_request.py
@@ -539,7 +539,7 @@ class PurchaseRequest(ModelSQL, ModelView):
     def create(cls, vlist):
         for vals in vlist:
             for field_name in ('product', 'quantity', 'uom', 'company'):
-                if not vals.get(field_name):
+                if vals.get(field_name) is None:
                     cls.raise_user_error('create_request')
         return super(PurchaseRequest, cls).create(vlist)