A declaration concerning the acceptance or waiver of the succession, of a legacy or of a reserved share, or a declaration designed to limit the liability of the person making the declaration, shall be valid as to form where it meets the requirements of:

1. (a)

   the law applicable to the succession pursuant to Article 21 or Article 22; or

2. (b)

   the law of the State in which the person making the declaration has his habitual residence.