When it comes to Letters of Credit, at the request of an applicant, the issuing bank may send a Pre-Advice Letter of issuance and/or amendment of the particular letter of credit.
A pre-advice is usually marked with a reference such as “full details to follow”.
Unless otherwise stated, the Pre-Advice Letterirrevocably commits the issuing bank to issue/amend the letter of credit as stated in the said Pre-Advice Letter.