I'm working with odoo v11.​

I need to bypass VAT number validation that is done by res.partner in module base_vat.

@api.constrains('vat', 'commercial_partner_country_id')
def check_vat(self):
        ...

I've done a new module with this python code:

class ResPartner(models.Model):
    _inherit = 'res.partner'

    @api.constrains('vat', 'commercial_partner_country_id')
    def check_vat(self):
        return True

But it doesn't work as far original check_vat  is still executed and not overwrited. I know I need to delete or bypass previous constraint_methods but I don't know how.

Any advice?