Okla. Stat. tit. 62, § 477

It shall be unlawful for any officer to issue, approve, sign or attest any warrant or certificate of indebtedness in any form in excess of the estimate of expenses made and approved for the current fiscal year or authorized for such a purpose by a bond issue, and any such warrant or certificate of indebtedness issued, approved or attested in excess of the estimate made and approved or authorized by a bond issue, shall not be a charge against the city or town upon which it is issued, but may be collected by civil action from any officer issuing, drawing, approving, signing or attesting the same, or from either or all of them, or from their bondsmen.