DerivFlexProductEligibilityIndicator (FIX tag 1243)

BooleanFIX 5.0 SP2

DerivFlexProductEligibilityIndicator (tag 1243) is a Boolean field defined in FIX 5.0 SP2. It appears in 3 message types, always optionally.

At a glance

Tag: 1243
Name: DerivFlexProductEligibilityIndicator
Datatype: Boolean (char)
Dialects: FIX 5.0 SP2
Messages: 3

What the specification says

Used to indicate if a product or group of product supports the creation of flexible securities.

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

A real message using tag 1243

DerivativeSecurityListRequest · FIX 5.0 SP2

Tag	Field	Wire value	Meaning
8	BeginString	FIXT.1.1
9	BodyLength	88
35	MsgType	z	DerivativeSecurityListRequest
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
320	SecurityReqID	EXAMPLE
559	SecurityListRequestType	0	Symbol
1243	DerivFlexProductEligibilityIndicator	N
10	CheckSum	147

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 1243 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
DerivativeSecurityList	AA	Optional	inside DerivativeSecurityDefinition › DerivativeInstrument
DerivativeSecurityListRequest	z	Optional	inside the DerivativeInstrument component
DerivativeSecurityListUpdateReport	BR	Optional	inside DerivativeSecurityDefinition › DerivativeInstrument

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 1243 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[1243];field?.name;   // "DerivFlexProductEligibilityIndicator"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a boolean

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