Okla. Stat. tit. 60, § 60-1604.9: Modification or termination of trust — Proceedings for

approval or disapproval.

A. In addition to the methods of termination prescribed by

Sections 29 through 32 of this act, a trust terminates to the extent

the trust is revoked or expires pursuant to its terms, no purpose of

the trust remains to be achieved, or the purposes of the trust have

become unlawful, contrary to public policy, or impossible to

achieve.

B. A proceeding to approve or disapprove a proposed

modification or termination under Sections 29 through 34 of this

act, or trust combination or division under Section 35 of this act,

may be commenced by a trustee or beneficiary, and a proceeding to

approve or disapprove a proposed modification or termination under

Section 29 of this act may be commenced by the settlor. The settlor

of a charitable trust may maintain a proceeding to modify the trust

under Section 31 of this act.