Okla. Stat. tit. 62 § 482
From and after the passage of this act, without regard to the time when funds may be collected and are available to pay the same, any and all warrants issued in payment of obligations of counties, townships, cities, towns and other municipal subdivisions or corporations of this state, shall as to time of payment, become due one (1) year after the close of the fiscal year for which the same was issued, and action thereon may be commenced in any court of competent jurisdiction to enforce the liability evidenced thereby. Unless action be commenced by the filing of suit thereon and service of summons by the aforesaid due date, the same shall be forever thereafter barred, and it shall not be necessary that such lapse of time be asserted as a defense in any such action in order that the defendant be relieved of liability thereon.
Okla. Stat. tit. 62, § 482