§ 26-1-2-1-407

(2) A promise that has become irrevocable and independent under subsection (1):(a) is effective and enforceable between the parties, and by or against third parties including assignees of the parties; and(b) is not subject to cancellation, termination, modification, repudiation, excuse, or substitution without the consent of the party to whom the promise runs.(3) This section does not affect the validity under any other law of a covenant in any lease contract making the lessee's promises irrevocable and independent upon the lessee's acceptance of the goods.As added by P.L.189-1991, SEC.3.