(a) When prior approval is required of purchases under bids, all documents required for the audit and approval of any contract for, or other purchase of, materials, equipment and supplies, under competitive bidding, including bids, copy of advertisement, if any, and other papers required under section 7.1 shall be submitted to the Comptroller, together with any contract or order pertaining thereto, after action by the Commissioner of the Office of General Services.

(b) If a State agency is exempt from the jurisdiction of the Commissioner of the Office of General Services, the contract, order, bids and other papers shall be forwarded directly to the Comptroller. No purchase order shall be issued in connection with any contract until the Comptroller's contract number appears thereon. On centralized purchase items this number shall be furnished by the Commissioner of the Office of General Services when he forwards the award list; in the other cases, Comptroller shall notify the State agency of the contract number assigned. The contract number shall appear on vouchers when present for payment. Agency open market purchases which include items under State contract will not be allowed unless the purchase order is approved by the Commissioner of the Office of General Services. Approval of such purchases may be withheld pending receipt of a waiver from the contractor.