12.3.45.1 Format Specifications
| Field Tag | Field Name | Format | Mandatory /Optional |
|---|---|---|---|
| 27 | Sequence of Total | 1!n/1!n | M |
| 20 | Transaction Reference Number | 16x | M |
| 21 | Related Reference Number | 6x | O |
| 22D | Form of Undertaking | 4!c | M |
| 23 | Undertaking Number | 16x | M |
| 52A | Issuer | A or D | O |
| 23H | Function of Message | 8!c | M |
| 45D | Narrative | 150*65z | M |
| 23X | File Identification | 4!c/65 | O |
Parent topic: MT 759 - Ancillary Trade Structured Message