SWIFT ISO 15022 - Qualifier MARG Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Pending Processing Reason Usages Message Type Tag Name of the tag MT537 24B ( field number 19 ) Reason MT537 24B ( field number 65 ) Reason MT548 24B ( field number 12 ) Reason MT549 24B ( field number 17 ) Reason