ListUpdateAction (FIX tag 1324)

charFIX 5.0 SP2

ListUpdateAction (tag 1324) is a char field defined in FIX 5.0 SP2. It appears in 2 message types, always optionally.

At a glance

Tag: 1324
Name: ListUpdateAction
Datatype: char
Dialects: FIX 5.0 SP2
Messages: 2

What the specification says

If provided, then Instrument occurrence has explicitly changed

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

A real message using tag 1324

SecurityListUpdateReport · FIX 5.0 SP2

Tag	Field	Wire value	Meaning
8	BeginString	FIXT.1.1
9	BodyLength	84
35	MsgType	BK	SecurityListUpdateReport
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
146	NoRelatedSym2 entries	2	repeating group
1324	ListUpdateAction	1
1324	ListUpdateAction	1
10	CheckSum	217

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 5.0 SP2 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.

Where tag 1324 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	Requiredness	Where in the message
DerivativeSecurityListUpdateReport	BR	Optional	inside the RelSymDerivSecUpdGrp component
SecurityListUpdateReport	BK	Optional	inside the SecLstUpdRelSymGrp component

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 1324 in TypeScript

decode.tsts

import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix50sp2";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const field = message.fields[1324];field?.name;   // "ListUpdateAction"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-fix50sp2

Try the decoder Source on GitHub