According to the Peppol documentation, Peppol BIS Billing 3 is a Core Invoice Usage Specification (CIUS) of EN 16931 with UBL as its syntax: documents that comply with it also comply with EN 16931. The checking aid checks Peppol BIS Billing 3 (UBL); we do not state obligations in individual countries here.
¹Note: This definition is for general orientation only and does not replace legal advice for your case.

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