D.C. Mun. Regs. tit. 27, § 3221
3221.1 If a retroactive downward price adjustment occurs under a redeterminable contract that provides for progress payments, the contracting officer shall do the following:
3221.2 The contracting officer shall increase the unliquidated progress payments amount if the contractor makes an interim or voluntary price reduction under a redeterminable or incentive contract.
SOURCE: Final Rulemaking published at 35 DCR 1636 (February 26, 1988).