Oregon Revised Statutes Public Financial Administration § 293.295

(1) The claim is supported by the approval of the state agency that incurred the obligation or made the expenditure on which the claim is based;

(2) Provision for payment of the claim is made by law and appropriation;

(3) The obligation or expenditure on which the claim is based is authorized as provided by law; and

(4) The claim otherwise satisfies requirements as provided by law.