SWIFT ISO 15022 - Code ACLA Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Automatic Market Claims: Will automatically give rise to market claims by the account servicer (typically, a CSD). Usages Message type Field number Tag MT564 (Corporate Action Notification) 51 22F (Indicator) MT566 (Corporate Action Confirmation) 37 22F (Indicator)