The States Parties to this Convention, Bearing in mind the broad objectives in the resolutions adopted by the sixth special session of the General Assembly of the United Nations on the establishment of a New International Economic Order, Considering that the development of international trade on the basis of equality and mutual benefit is an important element in promoting friendly relations among States, | 29. Among the more important limitations on the right of an aggrieved party to claim a remedy is the concept of fundamental breach. For a breach of contract to be fundamental, it must result in such detriment to the other party as substantially to deprive him of what he is entitled to expect under the contract, unless the result was neither foreseen by the party in breach nor foreseeable by a reaonsable person of the same kind in the same circumstances. A buyer can require the delivery of substitute goods only if the goods delivered were not in conformity with the contract and the lack of conformity constituted a fundamental breach of contract. The existence of a fundamental breach is one of the two circumstances that justifies a declaration of avoidance of a contract by the aggrieved party; the other circumstance being that, in the case of non-delivery of the goods by the seller or non-payment of the price or failure to take delivery by the buyer, the party in breach fails to perform within a reasonable period of time fixed by the aggrieved party.
