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