def METHOD_NAME(self):
    for record in self:
        if record.zip and 20 < len(record.zip):
            raise exceptions.ValidationError(
                _(
                    "TicketBAI Invoice %(name)s:\n"
                    "Customer %(customer)s ZIP Code %(zip)s longer than "
                    "expected. "
                    "Should be 20 characters max.!"
                )
                % {
                    "name": record.tbai_invoice_id.name,
                    "customer": record.name,
                    "zip": record.zip,
                }
            )