diff --git a/intrastat_product/models/intrastat_product_declaration.py b/intrastat_product/models/intrastat_product_declaration.py
index 9e537a1..e4394e5 100644
--- a/intrastat_product/models/intrastat_product_declaration.py
+++ b/intrastat_product/models/intrastat_product_declaration.py
@@ -501,7 +501,7 @@ class IntrastatProductDeclaration(models.Model):
             total_inv_weight = 0.0
             for inv_line in invoice.invoice_line:
 
-                if not inv_line.price_unit:
+                if not inv_line.price_subtotal:
                     continue
                 
                 if (