diff --git a/sale.py b/sale.py
index 1258e5d..5b9a0a0 100644
--- a/sale.py
+++ b/sale.py
@@ -376,9 +376,12 @@ class Sale(metaclass=PoolMeta):
 
             if v.get('unit_price'):
                 v['unit_price'] = Decimal(str(v['unit_price']))
+            # else:
+            #    v['unit_price'] = product.list_price 
+            if v.get('unit_price') == 0:
+                pass
             else:
-               v['unit_price'] = product.list_price 
-            v['base_price'] = product.list_price
+                v['base_price'] = product.list_price
             v['unit'] = product.template.default_uom.id
             v['description'] = product.name
             v['product'] = v['product']['id']