Okla. Stat. tit. 62, § 449

It shall be the duty of the county treasurer upon his being presented with a properly certified copy of such resolution to cancel and vacate all unpaid levies and taxes to the extent provided for in such resolution and to reduce the rate of levy and the amount of taxes due and unpaid upon all real and personal property and property of utilities within such municipal subdivision for all previous fiscal years to the extent provided for in such resolution and to enter such reduction upon the tax rolls of said county and to give due credit to such reduction in the collection of all such taxes. Laws 1935, p. 337, § 2.