A creditnote transaction T14 in Profile other than xx MUST have an invoice or creditnote reference identifier.
ubl:CreditNotelocal-name(/*) = 'CreditNote' and (((//cac:BillingReference/cac:InvoiceDocumentReference/cbc:ID) or (//cac:BillingReference/cac:CreditNoteDocumentReference/cbc:ID)) or (//cbc:ProfileID = 'urn:www.cenbii.eu:profile:biixx:ver2.0'))