D.C. Mun. Regs. tit. 8-B, § 3512
3512.1 A purchase order may be modified by using a purchase order modification form approved by the Director of Procurement. Each purchase order modification shall identify the order it modifies and shall contain an appropriate modification number.
3512.2 The contracting officer shall obtain a contractor's written acceptance of a purchase order modification if the written acceptance is determined by the contracting officer to be necessary to ensure the contractor's compliance with the purchase order as revised.
SOURCE: Final Rulemaking published at 39 DCR 2566 (April 10, 1992).