BG-11Seller tax representative partyBT-63Seller tax representative VAT identifier
Official rule text
[BR-56] Each Seller tax representative party (BG-11) shall have a Seller tax representative VAT identifier (BT-63).
Why this error occurs
The element is mandatory in this standard but is missing or empty in your file. Typical causes: the field is not filled in the invoicing software, the ERP export does not map it, or the element is present but contains only whitespace.
How to fix it
Add the element with a non-empty value at the position given by the context above. Check the master data (seller, buyer, payment) in your invoicing software; most tools expose the field under the business term name shown here. Re-validate after the change.
What the validator checks
Checked element (context):
UBL
cac:TaxRepresentativePartyTest (XPath):
exists(cac:PartyTaxScheme[cac:TaxScheme/(normalize-space(upper-case(cbc:ID)) = 'VAT')]/cbc:CompanyID)CII
//ram:SellerTaxRepresentativeTradePartyTest (XPath):
normalize-space(ram:SpecifiedTaxRegistration/ram:ID[@schemeID='VA']) != ''Check your invoice
Drop your XML or PDF on the validator and every failed rule is linked to its page here. Free, no account, the file is not stored.
Same check via API:
curl -F file=@invoice.xml https://einvoicechecker.com/v1/validateRelated rules
BR-18The Seller tax representative name shall be provided in the Invoice, if the Seller has…BR-19The Seller tax representative postal address shall be provided in the Invoice, if the…BR-20The Seller tax representative postal address shall contain a Tax representative…BR-AE-02An Invoice that contains an Invoice line where the Invoiced item VAT category code is…BR-AE-03An Invoice that contains a Document level allowance where the Document level allowance…BR-AE-04An Invoice that contains a Document level charge where the Document level charge VAT…BR-AF-02An Invoice that contains an Invoice line where the Invoiced item VAT category code is…BR-AF-03An Invoice that contains a Document level allowance where the Document level allowance…
Frequently asked questions
What does BR-56 mean?
BR-56 is a en 16931 core rule: Each Seller tax representative party (BG-11) shall have a Seller tax representative VAT identifier (BT-63).
Will my invoice be rejected because of BR-56?
Yes. BR-56 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals) reject the invoice until it is fixed.
Which formats does BR-56 apply to?
Every EN 16931 invoice: XRechnung, ZUGFeRD 2.x / Factur-X (profiles EN 16931, EXTENDED, XRECHNUNG), Peppol BIS Billing 3.0, and national CIUS such as the Dutch NLCIUS or the Italian/Spanish profiles. Syntax: UBL and CII.
Source: EN 16931-1:2017 schematron (CEN TC434, via Peppol BIS 3.0.20). Catalogue generated from the official schematron on 2026-10-14.