Art. 63 CISG
(1) The seller may fix an additional period of time of reasonable length for performance by the buyer of his obligations.
(2) Unless the seller has received notice from the buyer that he will not perform within the period so fixed, the seller may not, during that period, resort to any remedy for breach of contract. However, the seller is not deprived thereby of any right he may have to claim damages for delay in performance.
The Secretariat Commentary on Art. 59 of the 1978 New York Draft, predecessor to Art. 63 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.
Overview of case law on Art. 63 CISG: UNCITRAL Digest
The UNCITRAL Digest on the CISG can be used as a starting point to discover the relevant case law on this article.