In Iranian law, there are no clear legal provisions in this regard. Of course, the legal Articles: 191 – 192 -339 and 340 of the Civil Code refer to this issue In general. There are many interpretations in the form of books and articles on this subject.
1- The deal can only be concluded via offer and acceptance;
2- The issuance and sending of the invoice is, in fact, a sales offer;
3- If the invoice has a specified time limit for acceptance, it is valid. Customer acceptance after this period is not valid;
4- If there is no time limit in the invoice, Customer acceptance must be made within a reasonable period of time.
5- The seller can withdraw his invoice as long as the customer has not accepted the offer.
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