Rules / DE-R-027 · Markdown

Peppol BIS Billing 3.0 · rule

DE-R-027

Layer peppol·Checked against Peppol BIS Billing 3.0 2026.5

What does DE-R-027 mean? If both supplier and customer are located in Germany, "Seller contact telephone number" (BT-42) should contain a valid telephone number. A valid telephone should consist of 3 digits minimum.

Why did my invoice fail DE-R-027?

On domestic German invoices, the Seller contact telephone number (BT-42) should contain a valid telephone number, which the rule defines as having at least 3 digits. This is a plausibility check that catches placeholder or garbage values in the mandatory (per DE-R-006) phone field. In UBL the element is cac:AccountingSupplierParty/cac:Party/cac:Contact/cbc:Telephone.

Official rule text

If both supplier and customer are located in Germany, "Seller contact telephone number" (BT-42) should contain a valid telephone number. A valid telephone should consist of 3 digits minimum.

Common causes

• Placeholder values like "-", "n/a" or "0" entered to satisfy the mandatory-field rule
• A phone number consisting only of formatting characters with fewer than 3 digits
• An extension or short code entered instead of a full number

How do I fix it?

<cbc:Telephone>+49 89 987654-0</cbc:Telephone>

Related rules

DE-R-001 · DE-R-002 · DE-R-003 · DE-R-004 · DE-R-005 · DE-R-006 · DE-R-007 · DE-R-008