Sec. 2. This article applies to all powers of attorney created before July 1, 1991, unless the application of this article would cause one (1) of the following to occur:
(1) An adverse effect on a right given a principal or an attorney in fact.
(2) The extension of a right not intended to be given at the time the power of attorney was created.
(3) The imposition of a duty or liability on a person that was not intended to be imposed at the time the power of attorney was created.
(4) The relief of a person from a duty or liability imposed by the terms of a power of attorney or the operation of law.