48 CFR § 532.706-3
Clause for unenforceability of unauthorized obligations
November 17, 2020
(a) The contracting officer shall utilize the clause at 552.232-39, Unenforceability of Unauthorized Obligations (FAR DEVIATION) in all solicitations and contracts in lieu of FAR 52.232-39.
(b) The contracting officer shall utilize the clause at 552.232-78, Commercial Supplier Agreements—Unenforceable Clauses, in all solicitations and contracts (including orders) when not using FAR part 12.