D.C. Mun. Regs. tit. 19, § 4309
4309.1 Purchase orders shall be on a form approved by the CCO.
4309.2 Except as provided in Section 4306.3, the CCO shall issue each purchase order only on a fixed-price basis.
4309.3 Each purchase order shall include any trade and prompt payment discounts that are offered.
4309.4 Each purchase order shall contain a definite calendar date for delivery of supplies or performance of services.
4309.5 If the CCO wants to secure a binding contract between the offeror and the Library before delivery or performance, the CCO shall require the contractor's written acceptance of the purchase order.
SOURCE: Final Rulemaking published at 55 DCR 493 (January 18, 2008).