diff --git a/addons/sale/models/sale.py b/addons/sale/models/sale.py
index 911189102db..aca9f0660d1 100644
--- a/addons/sale/models/sale.py
+++ b/addons/sale/models/sale.py
@@ -811,7 +811,6 @@ class SaleOrderLine(models.Model):
             'uom_id': self.product_uom.id,
             'product_id': self.product_id.id or False,
             'layout_category_id': self.layout_category_id and self.layout_category_id.id or False,
-            'product_id': self.product_id.id or False,
             'invoice_line_tax_ids': [(6, 0, self.tax_id.ids)],
             'account_analytic_id': self.order_id.project_id.id,
             'analytic_tag_ids': [(6, 0, self.analytic_tag_ids.ids)],