Reject Message Fields
| Tag | Field Name | Required | Description |
|---|---|---|---|
| 35 | MsgType | Y | 3 |
| 45 | RefSeqNum | Y | MsgSeqNum of rejected message. |
| 371 | RefTagID | N | |
| 372 | RefMsgType | N | |
| 373 | SessionRejectReason | N | |
| 58 | Text | N |
Session level rejects are used to indicate violations of the session protocol or missing/bogus fields. These are to be expected during development and certification while the user adapts for Cboe, but should be extremely rare in production. Application layer rejects (like Order Reject and Cancel Reject) are normal.