48 C.F.R. § 50.103-3
(a) Contractor requests. A contractor seeking a contract adjustment shall submit a request in duplicate to the contracting officer or an authorized representative. The request, normally a letter, shall state as a minimum—
(4) Whether or not—
(b) Contractor certification. A contractor seeking a contract adjustment that exceeds the simplified acquisition threshold shall, at the time the request is submitted, submit a certification by a person authorized to certify the request on behalf of the contractor that—