def METHOD_NAME(self):
    for record in self:
        default_boards = (
            record.pms_room_type_id.board_service_room_type_ids.filtered(
                "by_default"
            )
        )
        # TODO Check properties (with different propertys is allowed)
        if any(
            default_boards.filtered(
                lambda l: l.id != record.id
                and l.pms_property_id == record.pms_property_id
            )
        ):
            raise UserError(_("""Only can set one default board service"""))