SWIFT ISO 15022 - Code NAFI Meanings Unaffirmed: Status of the transaction is unaffirmed. Unaffirmed: Confirmation of the trade has not been affirmed. Usages Message type Field number Tag MT509 (Trade Status Message) 10 25D (Status Code) MT540 (Receive Free) 35 25D (Status) MT541 (Receive Against Payment) 35 25D (Status) MT542 (Deliver Free) 35 25D (Status) MT543 (Deliver Against Payment) 35 25D (Status) MT549 (Request for Statement/Status Advice) 16 25D (Status)