| ISO20022

MT509: (7) Field 20a: Reference

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

Mandatory in optional subsequence A1

(Error code(s): T89)

Order	M/O	Qualifier	R/N	Options	Qualifier Description
1	M	RELA	N	C	Related Message Reference
	or	PREV	N	C	Previous Message Reference
	or	MAST	N	C	Master Reference
	or	BASK	N	C	Basket Reference
	or	INDX	N	C	Index Reference
	or	LIST	N	C	List Reference
	or	PROG	N	C	Program Reference
	or	TRRF	N	C or U	Deal Reference
	or	COMM	N	C	Common Reference
	or	ISSU	N	C	Issuer Reference
	or	BMRB	N	C	Block Matching Reference
	or	ALMR	N	C	Allocation Matching Reference

This qualified generic field specifies:

ALMR	Allocation Matching Reference	Reference of the linked message at the Detail/Allocation Level which identifies a centrally matched transaction.
BASK	Basket Reference	Reference identifying a basket trade.
BMRB	Block Matching Reference	Reference of the linked message at the Trade/Block Level which identifies a centrally matched transaction.
COMM	Common Reference	Unique reference agreed upon by the two trade counterparties to identify the trade.
INDX	Index Reference	Reference identifying an index trade.
ISSU	Issuer Reference	Reference that an issuer attributes to a fund (funds industry).
LIST	List Reference	List reference which identifies a list trade.
MAST	Master Reference	Unique and unambiguous identifier used to link a group of individual transactions together.
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 of the linked message which was previously received.
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.

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

MAST, BASK, INDX, LIST, PROG, COMM and ISSU references must not appear more than once in the message.