Okla. Stat. tit. 12A, § 12A-2A-406: Procedure on excused performance

PROCEDURE ON EXCUSED PERFORMANCE

(1) If the lessee receives notification of a material or

indefinite delay or an allocation justified under Section 45 of this

act, the lessee, by written notification to the lessor as to any

goods involved, and with respect to all of the goods if under an

installment lease contract the value of the whole lease contract is

substantially impaired (Section 57 of this act) may:

(a) terminate the lease contract (subsection (2) of

Section 52 of this act); or

(b) except in a finance lease that is not a consumer

lease, modify the lease contract by accepting the available quota in

substitution, with due allowance from the rent payable for the

balance of the lease term for the deficiency but without further

right against the lessor.

(2) If, after receipt of a notification from the lessor under

Section 45 of this act, the lessee fails so to modify the lease

agreement within a reasonable time not exceeding thirty (30) days,

the lease contract lapses with respect to any deliveries affected.