PossResend (FIX tag 97)
PossResend (tag 97) is a Boolean field defined in FIX 4.4 and FIX 4.2. It belongs to the session envelope: every FIX 4.4 message carries it, so it identifies the session rather than describing the business event. It is an enumerated field with 2 defined values.
At a glance
- Tag
- 97
- Name
- PossResend
- Datatype
- Boolean (char)
- Dialects
- FIX 4.4 and FIX 4.2
- Messages
- 93
- Valid values
- 2
What the specification says
Indicates that message may contain information that has been sent under another sequence number.
Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.
A real message using tag 97
| Tag | Field | Wire value | Meaning |
|---|---|---|---|
| 8 | BeginString | FIX.4.4 | |
| 9 | BodyLength | 116 | |
| 35 | MsgType | D | Order – Single |
| 49 | SenderCompID | BOARTEAM | |
| 56 | TargetCompID | COUNTERPARTY | |
| 34 | MsgSeqNum | 2 | |
| 97 | PossResend | N | Original transmission |
| 52 | SendingTime | 20240101-12:00:00.000 | |
| 11 | ClOrdID | ORD-10042 | |
| 54 | Side | 1 | Buy |
| 60 | TransactTime | 20240101-12:00:00.000 | |
| 40 | OrdType | 1 | Market |
| 10 | CheckSum | 241 |
Shown with | separators for readability. On the wire FIX uses SOH (0x01), an invisible control byte — and because BodyLength and CheckSum are computed over the actual bytes, the two forms have different checksums. Both are valid and both decode here.
Generated from the FIX 4.4 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.
Valid values
A value outside this list is not a parse error — the message still decodes — but validate() reports it as validate/value-not-in-enum.
| Value | Meaning | Symbolic name |
|---|---|---|
| Y | Possible resend | YES / PossibleResend |
| N | Original transmission | NO / OriginalTransmission |
Where tag 97 appears
Wire format
Y or N. Not 1/0, and not true/false. @boarteam/fix keeps the value as a string and, for enumerated fields, reports validate/value-not-in-enum when it is not a defined value.
Read tag 97 in TypeScript
import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix44";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const possResend = message.fields[97]?.raw;// e.g. "Y" — Possible resend// The dictionary also carries the labels:const label = fix.dictionary .fieldByTag(97) ?.enumValues?.find((e) => e.value === possResend) ?.description;Other Boolean fields
- 113ReportToExch
- 114LocateReqd
- 121ForexReq
- 123GapFillFlag
- 130IOINaturalFlag
- 141ResetSeqNumFlag
- 43PossDupFlag
- 208NotifyBrokerOfCredit
- 258TradedFlatSwitch
- 266AggregatedBook
- 325UnsolicitedIndicator
- 328InViewOfCommon
- 329DueToRelated
- 377SolicitedFlag
- 411ExchangeForPhysical
- 464TestMessageIndicator
- 547MDImplicitDelete
- 570PreviouslyReported
- 575OddLot
- 636WorkingIndicator
- 650LegalConfirm
- 700ReversalIndicator
- 719ContraryInstructionIndicator
- 720PriorSpreadIndicator
Decode this in your own code
The same engine that produced the decoded example above is an Apache-2.0 npm package with zero runtime dependencies. It runs in Node and in the browser, and parse() returns problems as data instead of throwing.
npm i @boarteam/fix @boarteam/fix-dict-fix44