Mo. Rev. Stat. § 456.1015
Requisites for exercise of power of appointment.
456.1015. Requisites for exercise of power of appointment. — A power of appointment is exercised only if:
(1) The instrument exercising the power is valid under applicable law;
(2) The terms of the instrument exercising the power:
(a) Manifest the powerholder's intent to exercise the power; and
(b) Subject to section 456.1030 , satisfy the requirements of exercise, if any, imposed by the donor; and
(3) To the extent the appointment is a permissible exercise of the power.
(L. 2016 H.B. 1765)