First, let me clarify that this message is sent by your bank (Issuing bank) to Advising bank (in the SWIFT terminology).
It defines the conditions under which a bank letter of credit has been prepared by the Sender.
Through the editor and the SWIFT generator in PTM, you must complete the following mandatory fields:
❑27 - Sequence of Total
❑40A - Form of Documentary Credit
❑20 - Documentary Credit Number
❑40E - Applicable Rules
❑31D - Date and Place of Expiry
❑50 - Applicant
❑59 - Beneficiary
❑32B - Currency Code, Amount
❑41a - Available With ... By ...
❑49 - Confirmation Instructions
The sample fields listed above are listed according to MT 2017 standard. Discrepancies to the latest standards are possible.