Okla. Stat. tit. 60, § 60-175.6b
Time limit for challenges to validity of prior
conveyances.
Any conveyance made and filed of record prior to the effective
date of this act placing real property or any interest therein in a
trust naming the trust itself as the grantee shall be valid for all
purposes unless any person claiming adversely to such trust or to
its successors shall file an affidavit setting forth the basis of
such in the office of the county clerk of the county or counties
wherein said property is located within one (1) year from the
effective date of this act.