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ISO 20022
Universal financial industry message scheme

Supplementary Data

Catalogue of messages

What is a SupplementaryData extension ?

Some ISO 20022 message definitions include a 'SupplementaryData' component that can be used by communities of users to add information to a message that is not catered for by other components of the message definition.

The SupplementaryData component is made of two elements:

  • a location element, allowing the supplementary data to be targeted at a specific point in the message,
  • a structured data element, which allows the identification of a separate ISO 20022 compliant schema and the inclusion of data that conforms to that schema.

Development of a SupplementaryData message extension

The information in the SupplementaryData component must be ISO 20022 compliant: it requires development of a compliant message extension model and its components must be registered in the ISO 20022 Data Dictionary.

The creation of a SupplementaryData message extension is subject to the approval of the SEG in charge of the message. Two use cases can be considered by the SEG:

  • the need to transport the additional information is too urgent to undertake the formal ISO 20022 maintenance process. The additional information will be included in the SupplementaryData component until specific components are created within the body of the messages at the occasion of the next maintenance;
  • the supplementary data is too specific or too volatile to deserve specific components within the body of the message itself. Use of a SupplementaryData message extension will avoid impacting the entire user base.

Use of a SupplementaryData message extension

The use, processing or transmission of a SupplementaryData message extension are to be preliminary agreed by all parties involved.

Creation and Maintenance of a SD component


Request for the creation of a SupplementaryData message extension must be introduced to the ISO 20022 Registration Authority using the usual Change Request form.


A message extension is specifically approved for use with a particular version of a message definition. If a new version of the message definition is approved, the related message extension(s) must be reviewed by the submitting organisation(s) and re-submitted to the Registration Authority for qualification with the new version of the message definition.

Registered ISO 20022 Supplementary Data message extensions

Including the Message Definition Report (MDR) and Schema of each registered Supplementary Data message extension

Version: 7  May 2024


This document clarifies, through a number of questions and answers, how to use the ISO 20022 Supplementary Data extension mechanism in ISO 20022 messages.

Version 1.7

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