The Right of Buyer for Deficiencies of Goods in the United Nations Convention on Contracts for the International Sale of Goods and the Iranian Legal System

According to the United Nations Convention on Contracts for the International Sale of Goods (1980), If the seller has delivered goods before the date for delivery, he may, up to that date, deliver any missing part or make up any deficiency in the quantity of the goods delivered, or deliver goods in replacement of any non-conforming goods delivered, or remedy any lack of conformity in the goods delivered ,provided that the exercise of this right does not cause the buyer unreasonable inconvenience or expense. One the other hand according to article 48 of the same convention the seller may, even after the date for delivery, remedy at his own expense any failure to perform his obligations, if he can do so without unreasonable delay and without causing the buyer unreasonable inconvenience or uncertainty of reimbursement by the seller of expenses advanced by the buyer. In Iran's legal system, there exists not any rule in this regard. However we will try to examine the possibility of this problem by focusing on some complementary principles, sic uter and the principle of self will.