UBL-CR-490: Leave the tax exchange rate out of the invoice

What it means

This rule checks that the invoice or credit note has no cac:TaxExchangeRate directly under its root element. This UBL element gives the rate for converting between the invoice currency and the currency used for VAT. EN 16931 has no structured field for this exchange rate. When VAT must be shown in another currency, you give the VAT accounting currency code (BT-6) and the invoice total VAT amount in that currency (BT-111), already converted.

Why it matters

EN 16931 represents VAT in another currency through its currency code and converted total, rather than through this structured exchange-rate element.

How to fix it

Delete cac:TaxExchangeRate directly under Invoice or CreditNote. If you need to report VAT in another currency, fill in the VAT accounting currency code (BT-6) and the total VAT amount in that currency (BT-111) in your invoicing software. If the buyer needs to see the rate, you can mention it in the invoice note (BT-22). Recheck the corrected file.

The rule as published

A UBL invoice should not include the TaxExchangeRate

Where this rule applies