E-Invoice ValidatorGlossary
The terms that appear in error messages and specifications — explained for people who need to repair a rejected invoice.
BT-24 — specification identifier
The field that says which rules the invoice should be checked against.
BT-10 — Buyer reference (route ID)
The reference the buyer expects to use to match the invoice.
Leitweg-ID
The German routing identifier for invoices to public clients.
BT-34 / BT-49 — Electronic addresses
The delivery addresses of the seller and buyer in the Peppol network.
schemeID
The code that indicates which directory an identifier comes from.
EndpointID
The UBL element that carries an electronic delivery address.
EN 16931
The European standard for electronic invoices.
CIUS
A country-specific or network-specific tightening of EN 16931.
Peppol
The European network for the exchange of e-invoices.
XRechnung
The German CIUS for e-invoices, especially towards authorities.
ZUGFeRD
German-French hybrid format: PDF with embedded XML.
Factur-X
The French name for the hybrid format PDF/A-3 with CII-XML.
UBL
Universal Business Language — one of the two EN-16931 syntaxes.
CII
Cross Industry Invoice — the second EN 16931 syntax, basis of ZUGFeRD.
Schematron
The technology behind the business rules of e-invoice verification.
XSD
The XML schema that validates the structure of an invoice file.
KoSIT
The body that maintains XRechnung - and the reference validator for authorities.
AS4
The transport protocol through which Peppol invoices are transferred.
Status: 12.10.2026