SWIFT ISO 15022 - Code FXDET Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning FX Details Usages Message type Field number Tag MT307 (Advice/Instruction of a Third Party FX Deal) 10 16R (Start of Block) MT307 (Advice/Instruction of a Third Party FX Deal) 28 16S (End of Block)