BR-DE-27 - Seller phone number should contain at least 3 digits
The Seller contact telephone number (BT-42) should contain at least three digits.
BR-DE-27 - Seller phone number should contain at least 3 digits
The Seller contact telephone number (BT-42) should contain at least three digits. This is an XRechnung rule (German KoSIT CIUS). It applies on top of EN 16931 and Peppol, and is mandatory for B2G invoicing in Germany.
This is an XRechnung rule (German KoSIT CIUS). It applies on top of EN 16931 and Peppol, and is mandatory for B2G invoicing in Germany.
What this rule checks
The Seller contact telephone number (BT-42) should contain at least three digits.
How to fix it
Enter a real telephone number in BT-42, with at least three digits.
Validate against this rule
This rule is part of EN 16931. Check your invoice with the validator that matches your format:
Related rules
Source: KoSIT XRechnung · Last verified: 2026-07-10
All validation rules