I'm using a self-hosted CE edition (V18) to manage invoices.
When sending an invoice via Peppol, at first, everything seems to work.
After a little while the status switches to "ERROR" and the history says:

"Peppol error: The Peppol Participant service group found on his Service Metadata Provider is invalid."

The technical log files do not show anything on the sending and/or failure.

Has anyone seen this before and any idea how to debug and resolve?

Thanks!