What does DT01 mean in ISO 20022?

DT01 is Invalid Date in the ExternalMandateReason1Code code set: Invalid date (eg, wrong settlement date)

Where does DT01 appear in a message?

For example in pain.010, element UndrlygAmdmntDtls/AmdmntRsn/Rsn/Cd.

ExternalMandateReason1Code

DT01 Reason Code: Invalid Date

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DT01 means invalid date in the ISO 20022 mandate reason code set. Invalid date (eg, wrong settlement date)

Code: DT01
ISO name: InvalidDate
Status: Registered
Last updated: 2010-11-01

Official definition

Invalid date (eg, wrong settlement date)

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

Messages and fields that use ExternalMandateReason1Code

Message	Element path
pain.010	UndrlygAmdmntDtls/AmdmntRsn/Rsn/Cd
pain.011	UndrlygCxlDtls/CxlRsn/Rsn/Cd
pain.012	UndrlygAccptncDtls/AccptncRslt/RjctRsn/Cd

DT01 in other code sets

DT01 questions

What does DT01 mean in ISO 20022?: DT01 is Invalid Date in the ExternalMandateReason1Code code set: Invalid date (eg, wrong settlement date)
Where does DT01 appear in a message?: For example in pain.010, element UndrlygAmdmntDtls/AmdmntRsn/Rsn/Cd.

All ExternalMandateReason1Code 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.