An invoice total with VAT MUST equal the invoice total without VAT plus the VAT total amount and the rounding of invoice total
//cac:LegalMonetaryTotal((cbc:PayableRoundingAmount) and ((xs:decimal(cbc:TaxInclusiveAmount)) = (round((xs:decimal(cbc:TaxExclusiveAmount) + (xs:decimal(sum(/ubl:Invoice/cac:TaxTotal/cbc:TaxAmount))) + xs:decimal(cbc:PayableRoundingAmount)) *10 * 10) div 100))) or (not(cbc:PayableRoundingAmount) and ((xs:decimal(cbc:TaxInclusiveAmount)) = round((xs:decimal(cbc:TaxExclusiveAmount) + (xs:decimal(sum(/ubl:Invoice/cac:TaxTotal/cbc:TaxAmount)))) * 10 * 10) div 100))