field4 rules
Every EN 16931, Peppol and XRechnung rule that constrains BT-43. If one of them fails, the others are usually worth a look — a wrong value in one field tends to break several checks at once.
| BR-DE-28 | warning | 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. … |
| BR-DE-7 | fatal | Das Element "Seller contact email address" (BT-43) muss übermittelt werden. |
| DE-R-007 | fatal | The element "Seller contact email address" (BT-43) shall be provided. |
| DE-R-028 | warning | "Seller contact email address" (BT-43) should contain exactly one @-sign, which should not be framed by a whitespace or a dot but by at least two characters on each side.… |