A legal document that has been added to, deleted from, or changed. A revision in the terms and circumstances of a letter of credit (e.g., an extension of the letter of credit's validity period, a shipping deadline, etc.), generally to fulfill the demands of the seller. The procedure for making a revision is called "amending" the letter of credit. In its most common form, a letter of amendment provides that one or more conditions previously required by the issuer to honor the credit have been removed. For example, the original terms of the credit may require that goods be shipped by a certain date to a specific address. If it is determined that this condition cannot be met, a new letter of credit may be issued requiring that the goods be shipped by a different date or to a different address. In this way, the issuer can remain flexible in responding to changes in the selling situation - without having to issue a new credit - while still meeting its obligations under the original letter of credit. An amendment may also include changes that are not directly related to the sale. For example, if it is discovered after the fact that some products were incorrectly listed on the original credit, these items may be removed from the amendment and the rest of the amendment processed in the same way as a regular credit request. Amendments must be in writing and signed by the authorized representative of the issuing bank. An oral amendment is not valid.