Allowance/charge amount must equal base amount * percentage/100 if base amount and percentage exists
pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument/cac:AllowanceCharge | pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument/pxs-taxdata:DocumentLine/cac:AllowanceCharge