BR-DE-28

The seller contact email address (BT-43) should be plausibly formed: exactly one @, at least two characters on each side, no space or dot immediately at the @, no leading or trailing dot.

Severity: Warning
Applies to: CII, UBL
Rule set: v2026-01-31

Official rule text

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.

Why it happens

Placeholders like "-" or "none", two addresses in one field ("a@firma.de; b@firma.de"), or a truncated value ending in a dot.

How to fix it

Enter exactly one valid address, e.g. invoices@company.com (cac:Contact/cbc:ElectronicMail in UBL, ram:EmailURIUniversalCommunication/ram:URIID in CII). Multiple recipients do not belong in the field — use a shared mailbox instead.

NormAPI provides technical validation, not tax or legal advice.