A powerholder's substantial compliance with a formal requirement of appointment imposed in a governing instrument by the donor, including a requirement that the instrument exercising the power of appointment make reference or specific reference to the power, is sufficient if:
1. Knows of and intends to exercise power. The powerholder knows of and intends to exercise the power; and
2. Does not impair a material purpose. The powerholder's manner of attempted exercise does not impair a material purpose of the donor in imposing the requirement.