SettlPartyIDSource (FIX tag 783)

charFIX 4.4FIX 5.0 SP2

SettlPartyIDSource (tag 783) is a char field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 7 message types, always optionally.

At a glance

Tag: 783
Name: SettlPartyIDSource
Datatype: char
Dialects: FIX 4.4 and FIX 5.0 SP2
Messages: 7

What the specification says

FIX 4.4

PartyIDSource value within a settlement parties component. Same values as PartyIDSource (447)

FIX 5.0 SP2

PartyIDSource value within a settlement parties component.

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

A real message using tag 783

AllocationInstruction · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	198
35	MsgType	J	Allocation Instruction
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
70	AllocID	EXAMPLE
71	AllocTransType	0	New
626	AllocType	1	Calculated (includes MiscFees and NetMoney)
857	AllocNoOrdersType	0	Not specified
54	Side	1	Buy
53	Quantity	1000000
6	AvgPx	1.09215
75	TradeDate	20240101
78	NoAllocs1 entry	1	repeating group
79	AllocAccount	EXAMPLE
85	NoDlvyInst1 entry	1	repeating group
165	SettlInstSource	1	Broker’s Instructions
781	NoSettlPartyIDs2 entries	2	repeating group
782	SettlPartyID	EXAMPLE
783	SettlPartyIDSource	1
782	SettlPartyID	EXAMPLE
783	SettlPartyIDSource	1
10	CheckSum	005

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 783 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
AllocationInstruction	J	Conditional	Optional	inside AllocGrp › SettlInstructionsData › DlvyInstGrp › SettlParties
AllocationInstructionAlert	BM	—	Optional	inside AllocGrp › SettlInstructionsData › DlvyInstGrp › SettlParties
AllocationReport	AS	Conditional	Optional	inside AllocGrp › SettlInstructionsData › DlvyInstGrp › SettlParties
CollateralAssignment	AY	Conditional	Optional	inside SettlInstructionsData › DlvyInstGrp › SettlParties
CollateralInquiry	BB	Conditional	Optional	inside SettlInstructionsData › DlvyInstGrp › SettlParties
CollateralReport	BA	Conditional	Optional	inside SettlInstructionsData › DlvyInstGrp › SettlParties
Confirmation	AK	Conditional	Optional	inside SettlInstructionsData › DlvyInstGrp › SettlParties
SettlementInstructions	T	Conditional	Optional	inside SettlInstGrp › SettlInstructionsData › DlvyInstGrp › SettlParties
SettlementObligationReport	BQ	—	Optional	inside SettlObligationInstructions › SettlDetails › SettlParties
TradeCaptureReport	AE	—	Optional	inside TrdCapRptSideGrp › SettlDetails › SettlParties
TradeCaptureReportAck	AR	—	Optional	inside TrdCapRptAckSideGrp › SettlDetails › SettlParties

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 783 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[783];field?.name;   // "SettlPartyIDSource"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