NoLegSecurityAltID (FIX tag 604)

NumInGroupFIX 4.4FIX 5.0 SP2group counter

NoLegSecurityAltID (tag 604) is a NumInGroup field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 50 message types, always optionally. Its datatype is NumInGroup, which makes it a repeating-group counter: its value is the number of entries that follow, not a quantity in its own right.

At a glance

Tag
604
Name
NoLegSecurityAltID
Datatype
NumInGroup (int)
Dialects
FIX 4.4 and FIX 5.0 SP2
Messages
50

What the specification says

FIX 4.4

Multileg instrument's individual security’s NoSecurityAltID. See NoSecurityAltID (454) field for description

FIX 5.0 SP2

Multileg instrument's individual security's NoSecurityAltID.

Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.

A real message using tag 604

ExecutionReport · FIX 4.4
TagFieldWire valueMeaning
8BeginStringFIX.4.4
9BodyLength181
35MsgType8Execution Report
49SenderCompIDBOARTEAM
56TargetCompIDCOUNTERPARTY
34MsgSeqNum2
52SendingTime20240101-12:00:00.000
37OrderIDORD-10042
17ExecIDEXEC-88117
150ExecType0New
39OrdStatus0New
54Side1Buy
151LeavesQty0
14CumQty1000000
6AvgPx1.09215
555NoLegs1 entry1repeating group
600LegSymbolEXAMPLE
604NoLegSecurityAltID2 entries2repeating group
605LegSecurityAltIDEXAMPLE
605LegSecurityAltIDEXAMPLE
10CheckSum222
Edit and decode it yourself

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.

Open in the full decoder →

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.

Where tag 604 appears

Requiredness is a property of the message, not of the field: the same tag can be optional in one message and conditionally required in another.

MessageMsgTypeFIX 4.4FIX 5.0 SP2Where in the message
Advertisement7OptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationInstructionJOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationInstructionAlertBMOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationReportASOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AssignmentReportAWOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralAssignmentAYOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralInquiryBBOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralInquiryAckBGOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralReportBAOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralRequestAXOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralResponseAZOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ConfirmationAKOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CrossOrderCancelReplaceRequesttOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CrossOrderCancelRequestuOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DerivativeSecurityListAAOptionalOptionalinside RelSymDerivSecGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DerivativeSecurityListUpdateReportBROptionalinside RelSymDerivSecUpdGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DontKnowTradeQOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
EmailCOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ExecutionAcknowledgementBNOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ExecutionReport8OptionalOptionalinside InstrmtLegExecGrp › InstrumentLeg › LegSecAltIDGrp
IOI6OptionalOptionalinside InstrmtLegIOIGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataIncrementalRefreshXOptionalOptionalinside MDIncGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataRequestVOptionalOptionalinside InstrmtMDReqGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataSnapshotFullRefreshWOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MassQuoteiOptionalOptionalinside QuotSetGrp › QuotEntryGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MassQuoteAcknowledgementbOptionalOptionalinside QuotSetAckGrp › QuotEntryAckGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MultilegOrderCancelReplaceACOptionalOptionalinside LegOrdGrp › InstrumentLeg › LegSecAltIDGrp
NewOrderCrosssOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
NewOrderMultilegABOptionalOptionalinside LegOrdGrp › InstrumentLeg › LegSecAltIDGrp
NewsBOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionMaintenanceReportAMOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionMaintenanceRequestALOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionReportAPOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
QuoteSOptionalOptionalinside LegQuotGrp › InstrumentLeg › LegSecAltIDGrp
QuoteCancelZOptionalOptionalinside QuotCxlEntriesGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
QuoteRequestROptionalOptionalinside QuotReqGrp › QuotReqLegsGrp › InstrumentLeg › LegSecAltIDGrp
QuoteRequestRejectAGOptionalOptionalinside QuotReqRjctGrp › QuotReqLegsGrp › InstrumentLeg › LegSecAltIDGrp
QuoteResponseAJOptionalOptionalinside LegQuotGrp › InstrumentLeg › LegSecAltIDGrp
QuoteStatusReportAIOptionalOptionalinside LegQuotStatGrp › InstrumentLeg › LegSecAltIDGrp
QuoteStatusRequestaOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RFQRequestAHOptionalOptionalinside RFQReqGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RequestForPositionsANOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RequestForPositionsAckAOOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitiondOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitionRequestcOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitionUpdateReportBPOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListyOptionalOptionalinside SecListGrp › InstrmtLegSecListGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListRequestxOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListUpdateReportBKOptionalinside SecLstUpdRelSymGrp › SecLstUpdRelSymsLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityStatusfOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityStatusRequesteOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportAEOptionalOptionalinside TrdInstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportAckAROptionalOptionalinside TrdInstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportRequestADOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportRequestAckAQOptionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp

Wire format

The number of entries in the repeating group that follows. The next field on the wire is the group's delimiter tag. @boarteam/fix parses the value as a number and reports parse/invalid-int when it does not lex as one; the raw string is kept either way.

Read tag 604 in TypeScript

decode.tsts
import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix44";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);// NoLegSecurityAltID is a group counter, so the entries live on message.groups —// NOT on message.fields. message.fields[604] is undefined.const entries = message.groups[604] ?? [];for (const entry of entries) {  // entry.fields is keyed by tag; entry.groups holds nested groups}

Other NumInGroup fields

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