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.