| ISO20022

MT508 Scope

This message is sent by an account servicer (account servicing institution) to an account owner or its designated agent. The account servicer may be a local agent (sub-custodian) acting on behalf of their global custodian customer, or a custodian acting on behalf of an investment management institution or a broker/dealer.

This message is used to confirm the increase or decrease in securities with a given status within a holding, that is, intra-position transfer.

MT508 Format Specifications

Status	Tag	Qualifier	Generic Field Name	Detailed Field Name	Content/Options	No.
Mandatory Sequence A General Information
M	16R			Start of Block	GENL	1
----->
M	20C	4!c	Reference	(see qualifier description)	:4!c//16x	2
-----\|
M	23G			Function of the Message	4!c[/4!c]	3
O	98a	PREP	Date/Time	Preparation Date/Time	A, C, or E	4
-----> Optional Repetitive Subsequence A1 Linkages
M	16R			Start of Block	LINK	5
O	13a	LINK	Number Identification	Linked Message	A or B	6
M	20C	4!c	Reference	(see qualifier description)	:4!c//16x	7
M	16S			End of Block	LINK	8
-----\| End of Subsequence A1 Linkages
M	16S			End of Block	GENL	9
End of Sequence A General Information
Mandatory Sequence B Intra-Position Details
M	16R			Start of Block	INPOSDET	10
O	95a	ACOW	Party	Account Owner	P or R	11
M	97a	4!c	Account	(see qualifier description)	A, B, or D	12
O	94a	SAFE	Place	Place of Safekeeping	B, C, or F	13
----->
M	36a	4!c	Quantity of Financial Instrument	(see qualifier description)	B or D	14
-----\|
O	13B	SSBI	Number Identification	Securities Sub-balance Identification	:4!c/[8c]/30x	15
O	19A	COMT	Amount	Collateral Monitor Amount	:4!c//[N]3!a15d	16
M	35B			Identification of the Financial Instrument	[ISIN1!e12!c] [4*35x]	17
Optional Subsequence B1 Financial Instrument Attributes
M	16R			Start of Block	FIA	18
O	94B	PLIS	Place	Place of Listing	:4!c/[8c]/4!c[/30x]	19
----->
O	22F	4!c	Indicator	(see qualifier description)	:4!c/[8c]/4!c	20
-----\|
----->
O	12a	4!c	Type of Financial Instrument	(see qualifier description)	A, B, or C	21
-----\|
O	11A	DENO	Currency	Currency of Denomination	:4!c//3!a	22
----->
O	98A	4!c	Date/Time	(see qualifier description)	:4!c//8!n	23
-----\|
----->
O	92A	4!c	Rate	(see qualifier description)	:4!c//[N]15d	24
-----\|
----->
O	13a	4!c	Number Identification	(see qualifier description)	A, B, or K	25
-----\|
----->
O	17B	4!c	Flag	(see qualifier description)	:4!c//1!a	26
-----\|
----->
O	90a	4!c	Price	(see qualifier description)	A or B	27
-----\|
----->
O	36a	4!c	Quantity of Financial Instrument	(see qualifier description)	B or D	28
-----\|
----->
O	35B			Identification of the Financial Instrument	[ISIN1!e12!c] [4*35x]	29
-----\|
O	70E	FIAN	Narrative	Financial Instrument Attribute Narrative	:4!c//10*35x	30
M	16S			End of Block	FIA	31
End of Subsequence B1 Financial Instrument Attributes
----->
M	98a	4!c	Date/Time	(see qualifier description)	A or C	32
-----\|
----->
O	22F	4!c	Indicator	(see qualifier description)	:4!c/[8c]/4!c	33
-----\|
O	70E	SPRO	Narrative	Settlement Instruction Processing Narrative	:4!c//10*35x	34
----->
M	93A	4!c	Balance	(see qualifier description)	:4!c/[8c]/4!c	35
-----\|
M	16S			End of Block	INPOSDET	36
End of Sequence B Intra-Position Details
Optional Sequence C Additional Information
M	16R			Start of Block	ADDINFO	37
----->
O	95a	4!c	Party	(see qualifier description)	P, Q, or R	38
-----\|
M	16S			End of Block	ADDINFO	39
End of Sequence C Additional Information

MT508 Network Validated Rules

C1 The 'Balance From' must be different from the 'Balance To'. The Sub-balance Type of field :93A::FROM must be different from the Sub-balance Type of field :93A::TOBA. This check applies to sequence B.

C2 If the message is a cancellation, that is, Function of the Message (field 23G) is CANC, then subsequence A1 (Linkages) must be present at least once in the message, and field :20C::PREV must be present in one and only one occurrence of A1; consequently, in all other occurrences of A1, field :20C::PREV is not allowed.

Sequence A if field :23G: is ...	Then subsequence A1 is ...	And field :20C::PREV is ...
CANC	Mandatory (minimum one occurrence of A1 must be present)	Mandatory in one occurrence of subsequence A1, and not allowed in all other occurrences of subsequence A1
NEWM	Optional	Not applicable

Sequence A

if field :23G: is ...

Then subsequence A1 is ...

And field :20C::PREV is ...

CANC

Mandatory (minimum one occurrence of A1 must be present)

Mandatory in one occurrence of subsequence A1, and not allowed in all other occurrences of subsequence A1

NEWM

Optional

Not applicable

MT508 Usage Rules

This message must not be used to report the movement of securities out of or into a safekeeping account. It reports only on movements that affect the status/availability of the security, that is, movements from one sub-balance to another or intra-position transfers, within that safekeeping account.
This message should also be used when the account servicer confirms an intra-position instruction, that is, following an MT 524.
In case of blocking of shares, depending on your internal processing method, you can use either an MT 566 Corporate Action Confirmation or an MT 508 Intra-Position Advice. The MT 566 is to be used when the securities safekeeping account is debited and another securities safekeeping account is credited. The MT 508 is to be used when the securities remain in the same securities safekeeping account but are given a blocked status.