§ 1432. Restrictions
Nothing in this chapter shall be construed to constitute authorization hereunder for—
(c)
the negotiation of purchases of or contracts for property or services required by law to be procured by formal advertising and competitive bidding;
(e)
the amendment of a contract negotiated under section
2304
(a)(15) [1] of title
10 or under section
252
(c)(13) [1] of title
41, to increase the contract price to an amount higher than the lowest rejected bid of any responsible bidder; or
(f)
the formalization of an informal commitment, unless it is found that at the time the commitment was made it was impracticable to use normal procurement procedures.
[1] See References in Text note below.