BR-DE-28
This is a German XRechnung rule (BR-DE) - a national requirement added on top of EN 16931 for invoices sent to German public authorities. It commonly concerns contact details, payment information or the buyer reference (Leitweg-ID).
- Read the requirement in the rule text below and add the missing element.
- Check the buyer reference (BT-10) carries a valid Leitweg-ID.
- Seller contact details (phone, email) are mandatory in XRechnung even though EN 16931 makes them optional.
In BT-43 soll genau ein @-Zeichen enthalten sein, welches nicht von einem Leerzeichen, einem Punkt, aber mindestens zwei Zeichen auf beiden Seiten flankiert werden soll. Ein Punkt sollte nicht am Anfang oder am Ende stehen.
Developers also reach this page searching for an “XRechnung validation error”, a “German e-invoice rejected” message, or how to correct a failed ZUGFeRD/Factur-X-style check — it's the same issue, explained above.
In short, in English: BT-43 must contain exactly one @ character, not adjacent to a space or a dot and with at least two characters on each side; a dot must not appear at the beginning or end.
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