Okla. Stat. tit. 58 § 335
When it shall appear upon the settlement of the accounts of any personal representative that a debt or debts of the deceased have been paid without the presentment of a claim pursuant to Section 334 of this title, and it shall be proven by competent evidence to the satisfaction of the district court that each such debt was justly due but for the claimant's failure to properly present a claim, was paid in good faith, that the amount paid was the true amount of each such indebtedness over and above all payments or setoffs, and that the estate is solvent, it shall be the duty of the said court to allow the said sums so paid in the settlement of said accounts, and the payment of any such debt shall not constitute a breach of fiduciary duty or responsibility by the personal representative.
Okla. Stat. tit. 58, § 335