SWIFT ISO 15022 - Code TIME Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning One Time Admittance: Admittance was given by the investor for one time registration. Usages Message type Field number Tag MT500 (Instruction to Register) 14 22F (Indicator) MT519 (Modification of Client Details) 13 22F (Indicator)