field1 rules
Every EN 16931, Peppol and XRechnung rule that constrains BT-29. 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-CO-26 | fatal | In order for the buyer to automatically identify a supplier, the Seller identifier (BT-29), the Seller legal registration identifier (BT-30) and/or the Seller VAT identif… |
Nothing is stored, and the whole invoice is checked, not just this rule. A PDF only works if it is Factur-X / ZUGFeRD — a PDF with the invoice XML inside it.