diff --git a/custom_addons/costing_mrp_bom/models/sale_order_line.py b/custom_addons/costing_mrp_bom/models/sale_order_line.py
index 1c16b5dd8..d5f262f86 100644
--- a/custom_addons/costing_mrp_bom/models/sale_order_line.py
+++ b/custom_addons/costing_mrp_bom/models/sale_order_line.py
@@ -97,5 +97,7 @@ class SaleOrderLine(models.Model):
     @api.depends('product_id', 'product_uom', 'product_uom_qty')
     def _compute_price_unit(self):
         for line in self:
+            if line.order_id and line.order_id.state == 'sale':
+                continue
             line.price_unit = 0.0