Used to group transactions together for reporting purposes independently of the physical device (DeviceSerialNumber) at which a transaction was actually processed.
| Command | In | Out |
| Authorisation | O | E |
| Debit | O | E |
| Credit | O | E |
| AuthorisationReversal | ||
| Void | ||
| GetData | ||
| Cancel | ||
| GetHMAC | ||
| GetSystemInfo |