48 C.F.R. § 49.203
(b) If the settlement is on an inventory basis (see 49.206-2(a)), the contractor shall not be paid more than the total of the amounts in subparagraphs (1), (2), and (3) below, less all disposal credits and all unliquidated advance and progress payments previously made under the contract:
(c) If the settlement is on a total cost basis (see 49.206-2(b)), the contractor shall not be paid more than the total of the amounts in subparagraphs (1) and (2) below, less all disposal and other credits, all advance and progress payments, and all other amounts previously paid under the contract: