10 U.S.C. § 3862
(a) Certification Requirement.— A request for equitable adjustment to contract terms or request for relief under Public Law 85–804 (50 U.S.C. 1431 et seq.) that exceeds the simplified acquisition threshold may not be paid unless a person authorized to certify the request on behalf of the contractor certifies, at the time the request is submitted, that—
(b) Restriction on Legislative Payment of Claims.— In the case of a contract of an agency named in section 2303(a) 1 of this title, no provision of a law enacted after , that directs the payment of a particular claim under such contract, a particular request for equitable adjustment to any term of such contract, or a particular request for relief under Public Law 85–804 (50 U.S.C. 1431 et seq.) regarding such contract may be implemented unless such provision of law—
1 Probably refers to section 3063 of this title, but amendment by section 1883(b)(2) of Pub. L. 116–283 was not executed as section 2303(a) was transferred to two different sections.