PEPPOL-EN16931-R005
VAT accounting currency code MUST be different from invoice currency code when provided.
What does this rule mean?
The VAT accounting currency (BT-6) is the same as the invoice currency (BT-5).
BT-6 exists only for the case where VAT is booked in a different currency — if it matches, the field is redundant and misleading.
Official rule message (standard)
VAT accounting currency code MUST be different from invoice currency code when provided.
Where the rule applies
Syntax: CII · UBL
The same rule, expressed twice: UBL and CII name the same fields with different paths. Running a CII file against the UBL rules is why you get errors that mean nothing.
UBL
cbc:TaxCurrencyCode
CII
ram:ApplicableHeaderTradeSettlement
Technical test
The rule passes when this Schematron expression holds true:
not(ram:TaxCurrencyCode) or normalize-space(ram:TaxCurrencyCode/text()) != normalize-space(ram:InvoiceCurrencyCode/text())How to fix it
A missing or incorrect business entry only you can supply. Add or correct it, then re-check.
Remove BT-6, or set the accounting currency that genuinely differs.
Correct the affected entry in your XML, then re-check the invoice. Validation runs locally in your browser — your file never leaves your machine.
Check an e-invoice here
Drop an XML or ZUGFeRD PDF file here. Validation runs locally in your browser against EN 16931 — your file never leaves your machine.