NoTrades (FIX tag 897)

NumInGroupFIX 4.4group counter

NoTrades (tag 897) is a NumInGroup field defined in FIX 4.4. It appears in 6 message types, always optionally. 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: 897
Name: NoTrades
Datatype: NumInGroup (int)
Dialects: FIX 4.4
Messages: 6

What the specification says

Number of trades in repeating group.

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

A real message using tag 897

CollateralInquiryAck · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	112
35	MsgType	BG	Collateral Inquiry Ack
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
909	CollInquiryID	EXAMPLE
945	CollInquiryStatus	0	Accepted
897	NoTrades2 entries	2	repeating group
571	TradeReportID	EXAMPLE
571	TradeReportID	EXAMPLE
10	CheckSum	020

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 897 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
CollateralAssignment	AY	Optional	inside the TrdCollGrp component
CollateralInquiry	BB	Optional	inside the TrdCollGrp component
CollateralInquiryAck	BG	Optional	inside the TrdCollGrp component
CollateralReport	BA	Optional	inside the TrdCollGrp component
CollateralRequest	AX	Optional	inside the TrdCollGrp component
CollateralResponse	AZ	Optional	inside the TrdCollGrp 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 897 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);// NoTrades is a group counter, so the entries live on message.groups —// NOT on message.fields. message.fields[897] is undefined.const entries = message.groups[897] ?? [];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