Okla. Stat. tit. 62, § 62-365.6: Levies to reimburse sinking fund

If all, or more than one-third (1/3) of a judgment be paid after

the levy for the first third thereof becomes final, out of surplus

cash as hereinbefore provided, levies to reimburse the sinking fund

shall thereafter be made only if there be other outstanding

indebtedness, in the same manner as if such prepayment had not been

made, but levy for interest shall not be included on such prepaid

portion other than for interest paid in excess of that already

provided for by tax levy.