diff --git a/addons/purchase_mrp/models/mrp_bom.py b/addons/purchase_mrp/models/mrp_bom.py
index dfa662b8b35..0190cef0a66 100644
--- a/addons/purchase_mrp/models/mrp_bom.py
+++ b/addons/purchase_mrp/models/mrp_bom.py
@@ -1,21 +1,22 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import fields, models, _
+from odoo import api, fields, models, _
 from odoo.exceptions import UserError
 
 
 class MrpBom(models.Model):
     _inherit = 'mrp.bom'
 
+    @api.constrains('product_id', 'product_tmpl_id', 'bom_line_ids', 'byproduct_ids', 'operation_ids')
     def _check_bom_lines(self):
         res = super()._check_bom_lines()
         for bom in self:
-            if all(not bl.cost_share for bl in bom.bom_lines):
+            if all(not bl.cost_share for bl in bom.bom_line_ids):
                 continue
-            if any(bl.cost_share < 0 for bl in bom.bom_lines):
+            if any(bl.cost_share < 0 for bl in bom.bom_line_ids):
                 raise UserError(_("Components cost share have to be positive or equals to zero."))
-            if sum(bom.bom_lines.mapped('cost_share')) != 100:
+            if sum(bom.bom_line_ids.mapped('cost_share')) != 100:
                 raise UserError(_("The total cost share for a BoM's component have to be 100"))
         return res