What does CUST mean in ISO 20022?

CUST is Requested By Customer in the ExternalCancellationReason1Code code set: Cancellation requested by the Debtor.

What should I do when I get CUST?

The receiving bank decides whether it can still stop or return the funds; follow up on the camt.029 answer. Many banks need the beneficiary's consent once the funds are credited.

Where does CUST appear in a message?

For example in camt.056, element Undrlyg/TxInf/CxlRsnInf/Rsn/Cd.

ExternalCancellationReason1Code

CUST Reason Code: Requested By Customer

Written and maintained by ZagTrader. Last reviewed 21 October 2026. How this page is sourced and checked

CUST means requested by customer in the ISO 20022 cancellation reason code set. The ordering customer asked for the payment to be cancelled.

Code: CUST
ISO name: RequestedByCustomer
Status: Registered
Last updated: 2017-02-08

Official definition

Cancellation requested by the Debtor.

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

What it means in practice

In a camt.056 cancellation request (or camt.055 from a customer), a cancellation reason code explains why the sender asks for a payment to be stopped or its funds returned. It sits in Undrlyg/TxInf/CxlRsnInf/Rsn/Cd.

The ordering customer asked for the payment to be cancelled. This is the usual reason in a camt.056 sent on a customer's request.

What to do

The receiving bank decides whether it can still stop or return the funds; follow up on the camt.029 answer. Many banks need the beneficiary's consent once the funds are credited.

Messages and fields that use ExternalCancellationReason1Code

Message	Element path
camt.056	Undrlyg/TxInf/CxlRsnInf/Rsn/Cd, Undrlyg/OrgnlGrpInfAndCxl/CxlRsnInf/Rsn/Cd
camt.008	CxlRsn/Rsn/Cd
camt.037	Dtl/CxlRsn/Cd
camt.055	Undrlyg/OrgnlGrpInfAndCxl/CxlRsnInf/Rsn/Cd, Undrlyg/OrgnlPmtInfAndCxl/CxlRsnInf/Rsn/Cd, Undrlyg/OrgnlPmtInfAndCxl/TxInf/CxlRsnInf/Rsn/Cd
camt.110	InvstgtnData/AddtlReqData/ReqdDbtAuthstn/CxlRsn/Cd
camt.116	versions 001.01

CUST in other code sets

CUST questions

What does CUST mean in ISO 20022?: CUST is Requested By Customer in the ExternalCancellationReason1Code code set: Cancellation requested by the Debtor.
What should I do when I get CUST?: The receiving bank decides whether it can still stop or return the funds; follow up on the camt.029 answer. Many banks need the beneficiary's consent once the funds are credited.
Where does CUST appear in a message?: For example in camt.056, element Undrlyg/TxInf/CxlRsnInf/Rsn/Cd.

All ExternalCancellationReason1Code 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.