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ExternalUnableToApplyIncorrectData1Code

MM21 Code: Mismatch Debtor Name Account

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MM21 means mismatch debtor name account in the ISO 20022 unable to apply incorrect data code set. Name and account of debtor are not matching.

Code
MM21
ISO name
MismatchDebtorNameAccount
Status
Registered
Last updated
2021-02-01

Official definition

Name and account of debtor are not matching.

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

Messages and fields that use ExternalUnableToApplyIncorrectData1Code

MessageElement path
camt.026Justfn/MssngOrIncrrctInf/IncrrctInf/Tp/Cd

MM21 questions

What does MM21 mean in ISO 20022?
MM21 is Mismatch Debtor Name Account in the ExternalUnableToApplyIncorrectData1Code code set: Name and account of debtor are not matching.
Where does MM21 appear in a message?
For example in camt.026, element Justfn/MssngOrIncrrctInf/IncrrctInf/Tp/Cd.

All ExternalUnableToApplyIncorrectData1Code 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.