PriorSpreadIndicator (FIX tag 720)

BooleanFIX 4.4

PriorSpreadIndicator (tag 720) is a Boolean field defined in FIX 4.4. It appears in 1 message type, always optionally.

At a glance

Tag: 720
Name: PriorSpreadIndicator
Datatype: Boolean (char)
Dialects: FIX 4.4
Messages: 1

What the specification says

Indicates if requesting a rollover of prior day’s spread submissions.

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

A real message using tag 720

PositionMaintenanceRequest · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	151
35	MsgType	AL	Position Maintenance Request
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
710	PosReqID	EXAMPLE
709	PosTransType	1	Exercise
712	PosMaintAction	1	New: used to increment the overall transaction quantity
715	ClearingBusinessDate	20240101
1	Account	ACCT-11223
581	AccountType	1	Account is carried on customer Side of Books
60	TransactTime	20240101-12:00:00.000
720	PriorSpreadIndicator	N
10	CheckSum	042

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 720 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
PositionMaintenanceRequest	AL	Optional	directly on the message body

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 720 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[720];field?.name;   // "PriorSpreadIndicator"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-fix44

Try the decoder Source on GitHub