Okla. Stat. tit. 68 § 3019
The secretary of the excise board shall immediately certify each appropriation as made by the excise board to the clerk or other issuing officer of the municipality for which the same is made. The several items of the estimate as made and approved by the excise board for each fiscal year shall constitute and are hereby declared to be an appropriation of funds for the several and specific purposes named in such estimate, and the appropriations thus made shall not be used for any other fiscal year or purposes whatsoever, except as provided in the preceding section. Each clerk or other issuing officer shall open and keep an account for the amount of each item of appropriation, showing the purpose for which the same is appropriated, and the date, number, and amount of each warrant thereon. No warrant or certificate of indebtedness in any form shall be issued, approved, signed or attested, on or against any appropriation for a purpose other than that for which the said item of appropriation was made, or in excess of the amount thereof.
Okla. Stat. tit. 68, § 3019