def METHOD_NAME(self):
    errors = {}
    for validator in [
        super().METHOD_NAME,
        self._validate_expose_in_dhcp_and_mac,
        self._validate_change_when_exposing_in_dhcp
    ]:
        try:
            validator()
        except ValidationError as e:
            e.update_error_dict(errors)
    if errors:
        raise ValidationError(errors)