Okla. Stat. tit. 70, § 70-5-186: Issuance of check, warrant or certificate of

indebtedness in payment of claim in excess of amounts unexpended and

unencumbered – Signature of board president and clerk.

It shall be unlawful for the governing board of education to

issue any check, warrant or certificate of indebtedness, in any

form, in payment of, or representing or acknowledging any account,

claim, or indebtedness against the school district, or to make any

contracts for, or incur any indebtedness against the school district

in excess of the amount then unexpended and unencumbered of the sum

appropriated for the specific item of estimated needs for such

purpose theretofore made, submitted, and approved, or authorized for

such purpose by a bond issue. The signature of the board president

and clerk shall be notification to the public that the check or

warrant is for the purpose and within the amount of the

appropriation charged.