SCHEDULE 1 The uniform Law on the international sale of goods
Chapter V.—Provisions common to the obligations of the seller and of the buyer
Section II.—Exemptions
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Where the circumstances which gave rise to the non-performance of the obligation constituted only a temporary impediment to performance, the party in default shall nevertheless be permanently relieved of his obligation if, by reason of the delay, performance would be so radically changed as to amount to the performance of an obligation quite different from that contemplated by the contract.