Okla. Stat. tit. 62, § 62-477: Limit of authority to issue - Liability of officer

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.