The Sequence Reset message adjusts expected sequence numbers.
| Mode | GapFillFlag (123) | Usage |
|---|---|---|
| Gap Fill | Y | Normal resend response |
| Reset | N or absent | Disaster recovery only |
Message Direction: Bidirectional
| Tag | Field Name | Type | Req'd | Description |
|---|---|---|---|---|
| Message Header | Y | MsgType = 4 | ||
| 123 | GapFillFlag | Boolean | O | Y=Gap fill mode, N=Reset mode |
| 36 | NewSeqNo | Int | Y | New expected sequence number |
| Message Trailer | Y |
Gap Fill to sequence 30:
8=FIX.4.2|9=60|35=4|49=T4Example|56=T4|50=TraderName|52=20120906-14:14:16.424| 36=30|123=Y|10=123|