Supplementary Data

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.

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.

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