UBL-CR-557
Warning EN 16931 (UBL)
Official rule text
A UBL invoice should not include the InvoiceLine AllowanceCharge PerUnitAmount
Seeing UBL-CR-557 in a rejection?
Run your file through the free validator to see every violation at once — or let NormDrift watch your reference invoices so the next ruleset release never surprises you.