ZagTrader

ExternalInvestigationReasonSubType1Code

CUST Reason Code: Request Customer Number

Written and maintained by ZagTrader. Last reviewed . How this page is sourced and checked

CUST means request customer number in the ISO 20022 investigation reason sub type code set. Customer number is requested. This is a number assigned by an issuer to identify a customer or a number assigned by a party to identify a creditor or debtor relationship.

Code
CUST
ISO name
RequestCustomerNumber
Status
Registered
Last updated
2024-02-28

Official definition

Customer number is requested. This is a number assigned by an issuer to identify a customer or a number assigned by a party to identify a creditor or debtor relationship.

Definition from the ISO 20022 External Code Sets, 2Q2026 (published 28 Aug 2026).

Messages and fields that use ExternalInvestigationReasonSubType1Code

MessageElement path
camt.110InvstgtnData/RsnSubTp/Cd
camt.111InvstgtnRspn/InvstgtnData/OrgnlInvstgtnRsnSubTp/Cd

CUST in other code sets

CUST questions

What does CUST mean in ISO 20022?
CUST is Request Customer Number in the ExternalInvestigationReasonSubType1Code code set: Customer number is requested. This is a number assigned by an issuer to identify a customer or a number assigned by a party to identify a creditor or debtor relationship.
Where does CUST appear in a message?
For example in camt.110, element InvstgtnData/RsnSubTp/Cd.

All ExternalInvestigationReasonSubType1Code codes · ISO 20022 code sets

The ISO 20022 code names and definitions on this page are reproduced from material published at iso20022.org under the ISO 20022 Intellectual Property Rights policy. This is not the official source: the up-to-date ISO 20022 standards and repository material are published only at iso20022.org. Explanations in our own words are by ZagTrader. ZagTrader is not affiliated with or endorsed by ISO or Swift.