NestedPartyIDSource (FIX tag 525)

charFIX 4.4FIX 5.0 SP2

NestedPartyIDSource (tag 525) is a char field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 22 message types, always optionally.

At a glance

Tag: 525
Name: NestedPartyIDSource
Datatype: char
Dialects: FIX 4.4 and FIX 5.0 SP2
Messages: 22

What the specification says

FIX 4.4

PartyIDSource value within a nested repeating group. Same values as PartyIDSource (447)

FIX 5.0 SP2

PartyIDSource value within a nested repeating group.

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

A real message using tag 525

NewOrderSingle · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	169
35	MsgType	D	Order – Single
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
11	ClOrdID	ORD-10042
78	NoAllocs1 entry	1	repeating group
79	AllocAccount	EXAMPLE
539	NoNestedPartyIDs2 entries	2	repeating group
524	NestedPartyID	EXAMPLE
525	NestedPartyIDSource	1
524	NestedPartyID	EXAMPLE
525	NestedPartyIDSource	1
54	Side	1	Buy
60	TransactTime	20240101-12:00:00.000
40	OrdType	1	Market
10	CheckSum	134

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 525 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.

Message	MsgType	FIX 4.4	FIX 5.0 SP2	Where in the message
AdjustedPositionReport	BL	—	Optional	inside PositionQty › NestedParties
AllocationInstruction	J	Conditional	Optional	inside AllocGrp › NestedParties
AllocationInstructionAck	P	—	Optional	inside AllocAckGrp › NestedParties
AllocationInstructionAlert	BM	—	Optional	inside AllocGrp › NestedParties
AllocationReport	AS	Conditional	Optional	inside AllocGrp › NestedParties
AllocationReportAck	AT	—	Optional	inside AllocAckGrp › NestedParties
ApplicationMessageRequest	BW	—	Optional	inside ApplIDRequestGrp › NestedParties
ApplicationMessageRequestAck	BX	—	Optional	inside ApplIDRequestAckGrp › NestedParties
AssignmentReport	AW	Conditional	Optional	inside PositionQty › NestedParties
CrossOrderCancelReplaceRequest	t	Conditional	Optional	inside SideCrossOrdModGrp › PreAllocGrp › NestedParties
ExecutionReport	8	Conditional	Optional	inside InstrmtLegExecGrp › NestedParties
MultilegOrderCancelReplace	AC	Conditional	Optional	inside LegOrdGrp › NestedParties
NewOrderCross	s	Conditional	Optional	inside SideCrossOrdModGrp › PreAllocGrp › NestedParties
NewOrderList	E	Conditional	Optional	inside ListOrdGrp › PreAllocGrp › NestedParties
NewOrderMultileg	AB	Conditional	Optional	inside LegOrdGrp › NestedParties
NewOrderSingle	D	Conditional	Optional	inside PreAllocGrp › NestedParties
OrderCancelReplaceRequest	G	Conditional	Optional	inside PreAllocGrp › NestedParties
PositionMaintenanceReport	AM	Conditional	Optional	inside PositionQty › NestedParties
PositionMaintenanceRequest	AL	Conditional	Optional	inside PositionQty › NestedParties
PositionReport	AP	Conditional	Optional	inside PositionQty › NestedParties
Quote	S	Conditional	Optional	inside LegQuotGrp › NestedParties
QuoteRequest	R	Conditional	Optional	inside QuotReqGrp › QuotReqLegsGrp › NestedParties
QuoteRequestReject	AG	Conditional	Optional	inside QuotReqRjctGrp › QuotReqLegsGrp › NestedParties
QuoteResponse	AJ	Conditional	Optional	inside LegQuotGrp › NestedParties
QuoteStatusReport	AI	Conditional	Optional	inside LegQuotStatGrp › NestedParties
RegistrationInstructions	o	Conditional	Optional	inside RgstDtlsGrp › NestedParties
TradeCaptureReport	AE	Conditional	Optional	inside TrdInstrmtLegGrp › NestedParties
TradeCaptureReportAck	AR	Conditional	Optional	inside TrdInstrmtLegGrp › NestedParties

Wire format

A single character. Most char fields are enumerated, so the value is one of a fixed set rather than arbitrary text. @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 525 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);const field = message.fields[525];field?.name;   // "NestedPartyIDSource"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a string

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

Try the decoder Source on GitHub