Okla. Stat. tit. 60, § 175.707
WRITTEN INSTRUMENT REQUIRED
A distribution under Section 3 or 4 of this act shall be made by a written instrument that is signed and acknowledged by the authorized trustee and filed with the records of the first trust and the second trust.
Laws 2021, SB 162, c. 268, § 7, eff. November 1, 2021.