| ISO20022

MT549: (21) Field 20a: Reference

FORMAT

Option C	:4!c//16x	(Qualifier)(Reference)
Option U	:4!c//52x	(Qualifier)(UTI Reference)

PRESENCE

Mandatory in optional sequence C

QUALIFIER

(Error code(s): T89)

Order	M/O	Qualifier	R/N	Options	Qualifier Description
1	M	CMIT	R	C	Counterparty Market Infrastructure Transaction Identification
	or	PREV	R	C	Previous Message Reference
	or	TRRF	R	C or U	Deal Reference
	or	COMM	R	C	Common Reference
	or	RELA	R	C	Related Message Reference
	or	MAST	R	C	Master Reference
	or	BASK	R	C	Basket Reference
	or	INDX	R	C	Index Reference
	or	LIST	R	C	List Reference
	or	PROG	R	C	Program Reference
	or	POOL	R	C	Pool Reference
	or	CORP	R	C	Corporate Action Reference
	or	MITI	R	C	Market Infrastructure Transaction Identification
	or	PCTI	R	C	Processor Transaction Identification

DEFINITION

This qualified generic field specifies:

BASK	Basket Reference	Reference identifying a basket trade.
CMIT	Counterparty Market Infrastructure Transaction Identification	Identification of a counterparty transaction assigned by a market infrastructure other than a central securities depository, for example, Target2-Securities.
COMM	Common Reference	Unique reference agreed upon by the two trade counterparties to identify the trade.
CORP	Corporate Action Reference	Reference assigned by the account servicer to unambiguously identify a corporate action event.
INDX	Index Reference	Reference identifying an index trade.
LIST	List Reference	Reference identifying a list trade.
MAST	Master Reference	Unique and unambiguous identifier used to link a group of individual transactions together.
MITI	Market Infrastructure Transaction Identification	Identification of a transaction assigned by a market infrastructure other than a central securities depository, for example, Target2-Securities.
PCTI	Processor Transaction Identification	Identification of the transaction assigned by the processor of the instruction other than the account owner the account servicer and the market infrastructure.
POOL	Pool Reference	Collective reference identifying a set of messages.
PREV	Previous Message Reference	Message reference of the linked message which was previously sent.
PROG	Program Reference	Program reference which identifies a program trade.
RELA	Related Message Reference	Message reference assigned by the client to the message to which this message is the reply.
TRRF	Deal Reference	Reference assigned to the trade by the Investment Manager OR the Broker/Dealer. This reference will be used throughout the trade life cycle to access/update the trade details.

NETWORK VALIDATED RULES

Reference must not start or end with a slash '/' and must not contain two consecutive slashes '//'.

USAGE RULES

The reference type used to identify the transaction must be in line with the reference types available for the message type requested by the MT549. For example, an MT549 must not request an MT567 using, as linked transaction reference, a COMM reference type that is not a transaction reference type available for Corporate Action messages.