Wisconsin Statutes Uniform Commercial Code (Ch. 401 to 420) § 411.407. Irrevocable promises: finance leases

(1) In the case of a finance lease that is not a consumer lease, the lessee's promises under the lease contract become irrevocable and independent upon the lessee's acceptance of the goods.

(2) A promise that becomes irrevocable and independent under sub. (1) is effective and enforceable between the parties, and by or against 3rd parties including assignees of the parties, and 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 a lease contract making the lessee's promises irrevocable and independent upon the lessee's acceptance of the goods.