# BH-XML-02 — Unknown invoice format

> https://billhorse.com/en/rules/bh-xml-02/

## What does this error mean?

The root element is neither UBL Invoice/CreditNote nor CII CrossIndustryInvoice.

## How to fix it

Check whether this is a different national format (e.g. FatturaPA) — those are not EN 16931 documents.