SWIFT ISO 15022 - Code DTRA Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Not Recognised: Counterparty has been contacted or contacted us, and does not recognise the transaction. Usages Message type Field number Tag MT537 (Statement of Pending Transactions) 19 24B (Reason) MT537 (Statement of Pending Transactions) 65 24B (Reason) MT548 (Settlement Status and Processing Advice) 12 24B (Reason) MT549 (Request for Statement/Status Advice) 17 24B (Reason)