`BR-DE-27`

XRechnung (KoSIT) · validation rule

XRechnung (KoSIT)Warning

The seller contact telephone number (BT-42) does not look like a phone number: XRechnung expects at least three digits. The sender must put a real number in cac:Contact/cbc:Telephone / ram:TelephoneUniversalCommunication/ram:CompleteNumber.

Field: seller.contact.phone (BT-42)
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/BR-DE-27?lang=en