SWIFT ISO 15022 - Code OPLF Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Odd Lot Preference: Tender or Exchange with the Odd Lot Preference. Usages Message type Field number Tag MT564 (Corporate Action Notification) 57 22F (Indicator) MT566 (Corporate Action Confirmation) 41 22a (Indicator)