3702967 - 'Error occurred while saving the changes. Participant already exists' upon registering an existing Participant to send documents in Configure Participants app

Attempting to add an already registered participant in the Configure Participants app, in the productive SMP of Peppol, leads to error message 'Error occurred while saving the changes. Participant already exists.'

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SAP Document Reporting and Compliance, Cloud Edition

participant id, sap drc, document reporting and compliance, cloud edition, peppol, register, Error occurred while saving the changes. Participant already exists, The participant ID you want to create is already registered in the Peppol network. If you continue, you can use this participant ID only for sending documents, not for receiving. Caution: You must only register participant IDs that belong to your company, error, peppol exchange, configure participants, app , KBA , LOD-LH-DRC-PAP , Peppol , LOD-LH-DCS-PAP , Digital Compliance Service for Peppol Access Point , Problem