What does FF01 mean in ISO 20022?

FF01 is Invalid File Format in the ExternalVerificationReason1Code code set: File format incomplete or invalid.

Where does FF01 appear in a message?

For example in acmt.024, element Rpt/Rsn/Cd.

ExternalVerificationReason1Code

FF01 Reason Code: Invalid File Format

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

FF01 means invalid file format in the ISO 20022 verification reason code set. File format incomplete or invalid.

Code: FF01
ISO name: InvalidFileFormat
Status: Registered
Last updated: 2023-11-30

Official definition

File format incomplete or invalid.

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

Messages and fields that use ExternalVerificationReason1Code

Message	Element path
acmt.024	Rpt/Rsn/Cd

FF01 in other code sets

FF01 questions

What does FF01 mean in ISO 20022?: FF01 is Invalid File Format in the ExternalVerificationReason1Code code set: File format incomplete or invalid.
Where does FF01 appear in a message?: For example in acmt.024, element Rpt/Rsn/Cd.

All ExternalVerificationReason1Code 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.