[ibr-tdd-31] – The cac:PostalAddress (BG-05) element MUST NOT contain elements other than cac:Country.
ibr-tdd-31/pxs:TaxData/pxs:ReportedTransaction/pxs:ReportedDocument/cac:AccountingSupplierParty/cac:Party/cac:PostalAddresscount(*[not(self::cac:Country)]) = 0