What does DU01 mean in ISO 20022?

DU01 is Duplicate Request in the ExternalInvestigationStatusReason1Code code set: Request message is duplicate, duplicate request message is rejected.

Where does DU01 appear in a message?

For example in camt.111, element InvstgtnRspn/InvstgtnSts/StsRsn/Cd.

ExternalInvestigationStatusReason1Code

DU01 Reason Code: Duplicate Request

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

DU01 means duplicate request in the ISO 20022 investigation status reason code set. Request message is duplicate, duplicate request message is rejected.

Code: DU01
ISO name: DuplicateRequest
Status: Registered
Last updated: 2024-02-28

Official definition

Request message is duplicate, duplicate request message is rejected.

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

Messages and fields that use ExternalInvestigationStatusReason1Code

Message	Element path
camt.111	InvstgtnRspn/InvstgtnSts/StsRsn/Cd

DU01 in other code sets

DU01 in ExternalStatusReason1Code

DU01 questions

What does DU01 mean in ISO 20022?: DU01 is Duplicate Request in the ExternalInvestigationStatusReason1Code code set: Request message is duplicate, duplicate request message is rejected.
Where does DU01 appear in a message?: For example in camt.111, element InvstgtnRspn/InvstgtnSts/StsRsn/Cd.

All ExternalInvestigationStatusReason1Code 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.