ErrorEN 16931Input required

UBL-SR-23

Seller tax representative VAT identifier shall occur maximum once, if the Seller has a tax representative

What does this rule mean?

Seller tax representative VAT identifier shall occur maximum once, if the Seller has a tax representative

A syntax rule binding the EN 16931 requirements to the concrete XML syntax (UBL or CII).

Official rule message (standard)

Seller tax representative VAT identifier shall occur maximum once, if the Seller has a tax representative

Where the rule applies

Syntax: UBL

Affected element (XPath):

  • cac:TaxRepresentativeParty

Technical test

The rule passes when this Schematron expression holds true:

(count(cac:Party/cac:PartyTaxScheme/cbc:CompanyID) <= 1)

How to fix it

A missing or incorrect business entry only you can supply. Add or correct it, then re-check.

Adjust the named element/attribute to the syntax requirement.

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.

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