Where it is established that a measure is inconsistent with Article 603 or 604, that measure is still permissible under this Chapter where it can be demonstrated that:
(a) the purpose of the measure is to achieve a legitimate objective;
(b) the measure does not operate to impair unduly the access of investors of a Party or enterprises that meet that legitimate objective;
(c) the measure is not more restrictive on investors of a Party or enterprises than necessary to achieve that legitimate objective; and
(d) the measure does not create a disguised restriction on investors of a Party or enterprises.