Prior to payment for goods and services, all items received as the result of written purchase orders, shall be examined and checked to insure that the vendor has complied with all terms and conditions which are specified in the purchase order. Payment for goods and services shall be in accordance with the conditions of the purchase order contract and upon satisfactory evidence that the vendor has delivered the merchandise or that the service has been performed, as stipulated in the purchase order or agreement. The Board of Education gives approval to the Business Administrator to issue...