What it means
The rule flags a cac:PowerOfAttorney under cac:TaxRepresentativeParty. EN 16931 has no field for it. The tax representative itself is described only by a name (BT-62), a VAT number (BT-63) and a postal address (BG-12). It applies to invoices and credit notes.
Why it matters
EN 16931 does not use a power of attorney block within the tax representative's details.
How to fix it
Leave the power of attorney block out of the tax representative's XML export. If you build the XML yourself, delete cac:PowerOfAttorney from cac:TaxRepresentativeParty. Recheck the exported file.
Once the file is corrected, check it again for free: Validate an invoice against EN 16931
Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice
The rule as published
A UBL invoice should not include the TaxRepresentativeParty PowerOfAttorney Where this rule applies
| Rule set | Version |
|---|---|
| EN 16931 (UBL) | 1.3.17 |
| EN 16931 (UBL credit note) | 1.3.17 |
| XRechnung 3.0 (UBL) | 3.0.2 |
| XRechnung 3.0 (UBL credit note) | 3.0.2 |
| Peppol BIS Billing 3.0 (invoice) | 2026.5 |
| Peppol BIS Billing 3.0 (credit note) | 2026.5 |
| SI-UBL 2.0 / NLCIUS (invoice) | 2.0.3.13 |
| SI-UBL 2.0 / NLCIUS (credit note) | 2.0.3.13 |
| France CTC (UBL invoice) | 1.4.0-04 |
| France CTC (UBL credit note) | 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 UBL-CR-340 still fails, and which other rules do.