When tax currency code is provided, two instances of the tax total must be present, but only one with tax subtotal.
cac urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2"| Card | Name | Description | 
|---|---|---|
| 1..1 | cbc:TaxAmount | 
             
                Invoice total VAT amount, Invoice total VAT amount in accounting currency 
                Example value:   | 
    
| 0..n | cac:TaxSubtotal | 
             
                VAT BREAKDOWN  | 
    
| Identifier/Error message | Flag | 
|---|---|
| PEPPOL-EN16931-R054 Only one tax total without tax subtotals MUST be provided when tax currency code is provided.  | 
            fatal |