Resend Request Message Fields
| Tag | Field Name | Required | Description |
|---|---|---|---|
| 35 | MsgType | Y | 2 |
| 7 | BeginSeqNo | Y | Sequence number of first message in range to be resent. |
| 16 | EndSeqNo | Y | 0 means + infinity |
A Resend Request message should be processed even if it is received ahead of sequence. Only after resending the requested range (all marked PossDupFlag = Y, including any gap fills) should Resend Request message be issued in the opposite direction.
Cboe will reject all orders received during FIX replay containing PossDupFlag = Y.
As discussed in the FIX 4.2 specification, it is possible to send an open or closed sequence range in a Resend Request message (an open range uses sequence zero as the EndSeqNo). Cboe will honor either type of request, but will always issue Resend Request messages with a closed sequence range.