field1 rules
Every EN 16931, Peppol and XRechnung rule that constrains BT-69. 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-20 | fatal | The Seller tax representative postal address (BG-12) shall contain a Tax representative country code (BT-69), if the Seller (BG-4) has a Seller tax representative party (… |
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.