developers:fixapi:sequencereset [Documentation]

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====== SEQUENCE RESET [35=4] ======

The Sequence Reset message adjusts expected sequence numbers.

===== Reset Modes =====
^ Mode ^ GapFillFlag (123) ^ Usage ^
| Gap Fill | Y | Normal resend response |
| Reset | N or absent | Disaster recovery only |

===== Message Specification =====

**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 | |

===== Sample Message =====

**Gap Fill to sequence 30:**
<code>
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|
</code>

===== Notes =====
  * Can only increase sequence numbers
  * Gap Fill: Must use correct sequence in Tag 34
  * Reset Mode: Ignores sequencing rules (disaster recovery only)
  * Multiple skipped messages require single reset