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diff --git a/addons/portal/models/res_partner.py b/addons/portal/models/res_partner.py
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+++ b/addons/portal/models/res_partner.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import models
+
+
+class ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    def can_edit_vat(self):
+        ''' `vat` is a commercial field, synced between the parent (commercial
+        entity) and the children. Only the commercial entity should be able to
+        edit it (as in backend). '''
+        return not self.parent_id