[ibr-tdd-42] – The cac:PartyTaxScheme element MUST NOT contain elements other than cbc:CompanyID (BT-048) and cac:TaxScheme.
ibr-tdd-42/pxs:TaxData/pxs:ReportedTransaction/pxs:ReportedDocument/cac:AccountingCustomerParty/cac:Party/cac:PartyTaxSchemecount(*[not(self::cbc:CompanyID or self::cac:TaxScheme)]) = 0