[NL-R-001] For suppliers in the Netherlands, if the document is a creditnote, the document MUST contain an invoice reference (cac:BillingReference/cac:InvoiceDocumentReference/cbc:ID)
NL-R-001pxs-taxdata:DocumentTypeCode[.='381'][$supplierCountryIsNL]pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument/cac:BillingReference/cac:InvoiceDocumentReference/cbc:ID