Unit TAX A TAX amount that applied to each item unit. About ID IBT-166Cardinality 0..0Section AlignedName Unit TAXSyntax binding ubl:Invoice / cac:InvoiceLine / cac:Item / cac:ClassifiedTaxCategory / cbc:PerUnitAmountRules IBR-CL-03: currencyID MUST be coded using ISO code list 4217 alpha-3.IBR-126: All currencyID attributes must have the same value as the Invoice currency code (ibt-005), except for amounts expected to be in Tax accounting currency (ibt-006).