field4 rules
Every EN 16931, Peppol and XRechnung rule that constrains BT-122. 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-52 | fatal | Each Additional supporting document (BG-24) shall contain a Supporting document reference (BT-122). |
| IS-R-008 | fatal | If seller is icelandic and invoice contains supporting description EINDAGI then the id form must be YYYY-MM-DD — Ef seljandi er íslenskur þá skal eindagi (BT-122, Documen… |
| IS-R-009 | fatal | If seller is icelandic and invoice contains supporting description EINDAGI invoice must have due date — Ef seljandi er íslenskur þá skal reikningur sem inniheldur eindaga… |
| IS-R-010 | fatal | If seller is icelandic and invoice contains supporting description EINDAGI the id date must be same or later than due date — Ef seljandi er íslenskur þá skal eindagi (BT-… |
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.