E-invoicing knowledge base

Peppol (Pan-European Public Procurement Online) is the dominant e-invoicing network in Europe.

EN 16931 is the European standard defining the semantic data model for electronic invoices, published by CEN and mandated by EU Directive 2014/55/EU.

E-invoicing (electronic invoicing) is the exchange of invoice documents between supplier and buyer in a structured electronic format — such as UBL, CII, XRechnung, or Factur-X — that can be automatically processed by software without manual data entry.

FatturaPA is the mandatory XML-based electronic invoice format used in Italy.

KSeF (Krajowy System e-Faktur — National e-Invoice System) is Poland’s centralized government platform for issuing, receiving, and storing structured electronic invoices.

XRechnung is Germany's national implementation (CIUS) of the EN 16931 European e-invoicing standard, mandatory for all public sector invoicing in Germany.

ZUGFeRD (Zentraler User Guide des Forums elektronische Rechnung Deutschland) is a hybrid e-invoice format that embeds machine-readable XML data inside a PDF/A-3 document.

Factur-X is the Franco-German hybrid e-invoice format (identical to ZUGFeRD 2.0+) that embeds structured XML data inside a PDF/A-3 document, compliant with EN 16931.

Universal Business Language (UBL) 2.1 is an OASIS XML standard for business documents including invoices, widely used as the syntax for Peppol BIS and national e-invoicing implementations.

Cross Industry Invoice (CII) is a UN/CEFACT XML syntax for electronic invoices, used as the base format for ZUGFeRD, Factur-X, and one of the two EN 16931-compliant syntaxes.

Invoice Navigator's Fixer tool automatically corrects technical errors in your e-invoices, making them compliant in seconds.

E-invoice remediation is the controlled, automated correction of structural compliance errors in electronic invoices, with explicit safety boundaries that prevent modification of financial fields like amounts, VAT rates, and bank details.

KoSIT (Koordinierungsstelle für IT-Standards) is the German federal coordination office for IT standards that maintains the official validation engine for XRechnung and EN 16931 e-invoices.

An Evidence Pack is Invoice Navigator's audit-ready compliance certificate containing the original invoice, validation results, remediation log, SHA-256 hash, QR verification code, and links to the exact rule versions used.

E-invoice validation is the process of checking a structured electronic invoice against schema, business rule, and country-specific rule sets to ensure it is compliant before submission to the buyer or tax authority.

XRechnung is a pure XML format required for German government invoicing, while ZUGFeRD is a hybrid format combining PDF and XML that works for both business and government transactions.

Peppol is a document exchange network, while Factur-X is a file format.

UBL (Universal Business Language) and CII (Cross-Industry Invoice) are two XML syntaxes for expressing EN 16931 invoices.

Invoice Navigator and ecosio both address EU e-invoice compliance, but from different angles.

Invoice Navigator and Storecove both offer APIs for e-invoice compliance, but serve different parts of the pipeline.

EU e-invoicing mandates require structured, machine-readable invoice data.

Peppol and XRechnung are not competing standards — they’re complementary.

Factur-X embeds structured CII XML inside a PDF/A-3 container.

EN 16931 is the European content standard — it defines what data an e-invoice must contain.

Italy’s Sistema di Interscambio (SDI) is a centralized government hub that processes every domestic e-invoice.