23 CFR § 636.408
Can communications be used to cure proposal deficiencies?
May 21, 2020
(a) No, communications must not be used to:
(1) Cure proposal deficiencies or material omissions;
(2) Materially alter the technical or cost elements of the proposal; and/or
(3) Otherwise revise the proposal.
(b) Communications may be considered in rating proposals for the purpose of establishing the competitive range.