Okla. Stat. tit. 62 § 34.41
Appropriations shall not be available for contractual or expenditure purposes until allotted as provided in the Oklahoma State Finance Act. Appropriations made by the Legislature to each state agency are hereby declared to be maximum, conditional and proportionate appropriations. The purpose of this section is to make appropriations payable in full in the amounts named only in the event that the estimated budget resources within each state fund during each fiscal year are sufficient to pay all of the appropriations for such fiscal year in full. It is also the purpose of this provision to ensure that there shall be no overdraft or deficit created in the several funds of the state at the end of any fiscal year, and the Director of the Office of Management and Enterprise Services is directed and required so to administer the Oklahoma State Finance Act to prevent such overdraft or deficit.
Okla. Stat. tit. 62, § 34.41