IOINaturalFlag (FIX tag 130)

BooleanFIX 4.4FIX 4.2

IOINaturalFlag (tag 130) is a Boolean field defined in FIX 4.4 and FIX 4.2. It appears in 1 message type, always optionally. It is an enumerated field with 2 defined values.

At a glance

Tag: 130
Name: IOINaturalFlag
Datatype: Boolean (char)
Dialects: FIX 4.4 and FIX 4.2
Messages: 1
Valid values: 2

What the specification says

Indicates that IOI is the result of an existing agency order or a facilitation position resulting from an agency order, not from principal trading or order solicitation activity.

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

A real message using tag 130

IOI · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	95
35	MsgType	6	Indication of Interest
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
23	IOIID	EXAMPLE
28	IOITransType	N	New
54	Side	1	Buy
27	IOIQty	S	Small
130	IOINaturalFlag	N	Not natural
10	CheckSum	080

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.

Valid values

A value outside this list is not a parse error — the message still decodes — but validate() reports it as validate/value-not-in-enum.

Value	Meaning	Symbolic name
Y	Natural	YES / Natural
N	Not natural	NO / NotNatural

Where tag 130 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 4.2	Where in the message
IOI	6	Optional	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 130 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 iOINaturalFlag = message.fields[130]?.raw;// e.g. "Y" — Natural// The dictionary also carries the labels:const label = fix.dictionary  .fieldByTag(130)  ?.enumValues?.find((e) => e.value === iOINaturalFlag)  ?.description;

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