NoTradingSessionRules (FIX tag 1309)

NumInGroupFIX 5.0 SP2group counter

NoTradingSessionRules (tag 1309) is a NumInGroup field defined in FIX 5.0 SP2. 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: 1309
Name: NoTradingSessionRules
Datatype: NumInGroup (int)
Dialects: FIX 5.0 SP2
Messages: 6

What the specification says

Allows trading rules to be expressed by trading session

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

A real message using tag 1309

SecurityDefinition · FIX 5.0 SP2

Tag	Field	Wire value	Meaning
8	BeginString	FIXT.1.1
9	BodyLength	99
35	MsgType	d	SecurityDefinition
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
1310	NoMarketSegments1 entry	1	repeating group
1301	MarketID	XNAS
1309	NoTradingSessionRules2 entries	2	repeating group
336	TradingSessionID	1	Day
336	TradingSessionID	1	Day
10	CheckSum	253

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 1309 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 › MarketSegmentGrp › SecurityTradingRules › TradingSessionRulesGrp
DerivativeSecurityListUpdateReport	BR	Optional	inside DerivativeSecurityDefinition › MarketSegmentGrp › SecurityTradingRules › TradingSessionRulesGrp
SecurityDefinition	d	Optional	inside MarketSegmentGrp › SecurityTradingRules › TradingSessionRulesGrp
SecurityDefinitionUpdateReport	BP	Optional	inside MarketSegmentGrp › SecurityTradingRules › TradingSessionRulesGrp
SecurityList	y	Optional	inside SecListGrp › SecurityTradingRules › TradingSessionRulesGrp
SecurityListUpdateReport	BK	Optional	inside SecLstUpdRelSymGrp › SecurityTradingRules › TradingSessionRulesGrp

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 1309 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);// NoTradingSessionRules is a group counter, so the entries live on message.groups —// NOT on message.fields. message.fields[1309] is undefined.const entries = message.groups[1309] ?? [];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-fix50sp2

Try the decoder Source on GitHub