Allowance/charge base amount MUST be provided when allowance/charge percentage is provided.
PEPPOL-EN16931-R041-SGubl:Invoice/cac:AllowanceCharge[cbc:MultiplierFactorNumeric and not(cbc:BaseAmount)] | ubl:Invoice/cac:InvoiceLine/cac:AllowanceCharge[cbc:MultiplierFactorNumeric and not(cbc:BaseAmount)] | cn:CreditNote/cac:AllowanceCharge[cbc:MultiplierFactorNumeric and not(cbc:BaseAmount)] | cn:CreditNote/cac:CreditNoteLine/cac:AllowanceCharge[cbc:MultiplierFactorNumeric and not(cbc:BaseAmount)]false()