Allowance/charge amount must equal base amount * percentage/100 if base amount and percentage exists
PEPPOL-EN16931-R040-SGubl:Invoice/cac:AllowanceCharge | ubl:Invoice/cac:InvoiceLine/cac:AllowanceCharge | cn:CreditNote/cac:AllowanceCharge | cn:CreditNote/cac:CreditNoteLine/cac:AllowanceChargenot(cbc:MultiplierFactorNumeric and cbc:BaseAmount) or u:slack(if (cbc:Amount) then cbc:Amount else 0, (xs:decimal(cbc:BaseAmount) * xs:decimal(cbc:MultiplierFactorNumeric)) div 100, 0.02)