NoCapacities (FIX tag 862)

NumInGroupFIX 4.4group counter

NoCapacities (tag 862) is a NumInGroup field defined in FIX 4.4. It appears in 1 message type and is required in 1 of them. Its datatype is NumInGroup, which makes it a repeating-group counter: its value is the number of entries that follow, not a quantity in its own right.

At a glance

Tag: 862
Name: NoCapacities
Datatype: NumInGroup (int)
Dialects: FIX 4.4
Messages: 1

What the specification says

Number of repeating OrderCapacity entries.

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

A real message using tag 862

Confirmation · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	238
35	MsgType	AK	Confirmation
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
664	ConfirmID	EXAMPLE
666	ConfirmTransType	0	New
773	ConfirmType	1	Status
665	ConfirmStatus	1	Received
60	TransactTime	20240101-12:00:00.000
75	TradeDate	20240101
80	AllocQty	1000000
54	Side	1	Buy
862	NoCapacities2 entries	2	repeating group
528	OrderCapacity	A	Agency
863	OrderCapacityQty	1000000
528	OrderCapacity	A	Agency
863	OrderCapacityQty	1000000
79	AllocAccount	EXAMPLE
6	AvgPx	1.09215
381	GrossTradeAmt	125000.00
118	NetMoney	125000.00
10	CheckSum	099

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 862 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
Confirmation	AK	Required	inside the CpctyConfGrp component

Wire format

The number of entries in the repeating group that follows. The next field on the wire is the group's delimiter tag. @boarteam/fix parses the value as a number and reports parse/invalid-int when it does not lex as one; the raw string is kept either way.

Read tag 862 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);// NoCapacities is a group counter, so the entries live on message.groups —// NOT on message.fields. message.fields[862] is undefined.const entries = message.groups[862] ?? [];for (const entry of entries) {  // entry.fields is keyed by tag; entry.groups holds nested groups}

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