`DE-R-026`

XRechnung (KoSIT) · validation rule

XRechnung (KoSIT)Warning

Peppol national rule for German parties (same requirement as XRechnung BR-DE-26): The invoice type code (BT-3) is 384 (corrected invoice) but no preceding invoice reference (BG-3) is given. The sender should add cac:BillingReference/cac:InvoiceDocumentReference/cbc:ID / ram:InvoiceReferencedDocument/ram:IssuerAssignedID with the number of the invoice being corrected.

Field: document.preceding_invoices (BG-3)
Rule set: XRechnung (KoSIT)
Rule-set version: XRechnung 3.0.2 Schematron 2.6.0 · in force since 2026-10-17 · Rule-set changelog
Who has to fix it: The sender

This is a property of the file you received, so it cannot be corrected on your side without changing the document — ask the supplier to reissue it.

Check your own invoice

Drop the file that failed. We parse it, run the official rule sets against it and list every finding with a fix — 20 invoices per day, no key, nothing stored.

Open the live demo

Same explanation over the API: GET /v1/rules/DE-R-026?lang=en