Mandate reference MUST be provided for direct debit.
PEPPOL-EN16931-R061pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument/cac:PaymentMeans[some $code in tokenize('49 59', '\s') satisfies normalize-space(cbc:PaymentMeansCode) = $code]cac:PaymentMandate/cbc:ID