Action that caused the event to occur.
| Code | Meaning |
|---|---|
| 1 | Add order request |
| 2 | Modify order request |
| 3 | Delete order request |
| 4 | Order entered out-of-band |
| 5 | Order modified out-of-band |
| 6 | Order deleted out-of-band |
| 7 | Order activated or triggered |
| 8 | Order expired |
| 9 | Reserve order refreshed |
| 10 | Away market better |
| 11 | Corporate action |
| 12 | Start of day |
| 13 | End of day |