SWIFT ISO 15022 - Code RMDR Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Reminder: Message sent as a reminder of an event taking place. Usages Message type Field number Tag MT564 (Corporate Action Notification) 4 23G (Function of the Message) MT568 (Corporate Action Narrative) 4 23G (Function of the Message)