What it means
When an invoice line has VAT category O (not subject to VAT, BT-151), the invoice must not contain the seller's VAT identifier (BT-31), the VAT identifier of the seller's tax representative (BT-63) or the buyer's VAT identifier (BT-48).
Why it matters
Category O is meant for invoices that fall entirely outside the VAT system, such as those of a seller who is not registered for VAT. A VAT number on the same invoice says the opposite, so the recipient cannot tell how to treat it and rejects it.
How to fix it
If you are not registered for VAT, remove the VAT numbers from your company details and from the customer, or turn off printing them, and export again. If you are registered for VAT, category O is probably wrong: use E (exempt), Z (zero rated), AE (reverse charge) or the standard rate instead.
The rule as published
An Invoice that contains an Invoice line (BG-25) where the Invoiced item VAT category code (BT-151) is "Not subject to VAT" shall not contain the Seller VAT identifier (BT-31), the Seller tax representative VAT identifier (BT-63) or the Buyer VAT identifier (BT-48). Business terms: BG-25, BT-31, BT-48, BT-63, BT-151
Where this rule applies
| Rule set | Version |
|---|---|
| EN 16931 (UBL) | 1.3.17 |
| EN 16931 (UBL credit note) | 1.3.17 |
| EN 16931 (CII) | 1.3.17 |
| XRechnung 3.0 (UBL) | 3.0.2 |
| XRechnung 3.0 (UBL credit note) | 3.0.2 |
| XRechnung 3.0 (CII) | 3.0.2 |
| Peppol BIS Billing 3.0 (invoice) | 2026.5 |
| Peppol BIS Billing 3.0 (credit note) | 2026.5 |
| Factur-X 1.09 BASIC | 1.0.9-2 |
| Factur-X 1.09 EN 16931 | 1.0.9-2 |
| ZUGFeRD 2.5 BASIC | 2.5.2 |
| ZUGFeRD 2.5 EN 16931 | 2.5.2 |
| SI-UBL 2.0 / NLCIUS (invoice) | 2.0.3.13 |
| SI-UBL 2.0 / NLCIUS (credit note) | 2.0.3.13 |
| NLCIUS (CII) | 1.0.3.13 |
| France CTC (UBL invoice) | 1.4.0-04 |
| France CTC (UBL credit note) | 1.4.0-04 |
| France CTC (CII) | 1.4.0-04 |
| CIUS-RO UBL Invoice 1.0.9 | 1.0.9 |
| CIUS-RO UBL Credit Note 1.0.9 | 1.0.9 |
Check your file
Drop your e-invoice to see whether BR-O-02 still fails, and which other rules do.
Related rules
- BR-AE-02 Reverse-charge lines need both VAT numbers
- BR-IC-02 Intra-community supplies need your VAT number and the buyer's
- BR-AF-02 IGIC lines need a tax number for the seller
- BR-AG-02 An IPSI invoice line needs the seller's tax number
- BR-E-02 VAT-exempt lines need your VAT number
- BR-G-02 Exports outside the EU need your VAT number