14-2-616. PROCEDURE ON NOTICE CLAMING EXCUSE.

1. Where the buyer receives notification of a material or indefinite delay or an allocation justified under the preceding section he may by written notification to the seller as to any delivery concerned, and where the prospective deficiency substantially impairs the value of the whole contract under the provisions of this Chapter relating to breach of installment contracts (Section 612), then also as the whole,
   1. Terminate and thereby discharge any unexecuted portion of the contract; or
   2. Modify the contract by agreeing to take his available quota in substitution.
2. If after receipt of such notification from the seller the buyer fails so to modify the contract within a reasonable time not exceeding thirty days the contract lapses with respect to any deliverable affected.
3. The provision of this section may not be negated by agreement except in so far as the seller has assumed a greater obligation under the preceding section.