DE-R-007: The element "Seller contact email address" shall be provided

StandardPeppol BIS Billing 3.0 country rules (NL, DE, IT, SE, DK, NO, GR, IS)CountryGermanySeverityError: the invoice is rejectedSyntaxUBLBusiness terms

BT-43 Seller contact email address

Applies toOnly when the seller (or for some rules the buyer) is in the named country: the rule is triggered by the country code of the party. Dutch rules implement NLCIUS, German rules the XRechnung requirements inside Peppol.

Official rule text

[DE-R-007] The element "Seller contact email address" (BT-43) shall be provided.

Why this error occurs

The value is present but does not match the required pattern: wrong date format, an IBAN with a wrong check digit, an e-mail address without a valid structure, a URL without scheme, or a text with forbidden characters.

How to fix it

Correct the value so it matches the format named in the rule: dates as YYYY-MM-DD in UBL and YYYYMMDD with format="102" in CII, IBANs without spaces and with a valid checksum, e-mail addresses with exactly one @, URLs starting with http:// or https://.

What the validator checks

Checked element (context):

UBL

(/ubl-invoice:Invoice/cac:AccountingSupplierParty/cac:Party/cac:Contact | /ubl-creditnote:CreditNote/cac:AccountingSupplierParty/cac:Party/cac:Contact)[$supplierCountryIsDE and $customerCountryIsDE]

Test (XPath):

cbc:ElectronicMail[boolean(normalize-space(.))]

Check your invoice

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Same check via API:

curl -F file=@invoice.xml https://einvoicechecker.com/v1/validate

Related rules

DE-R-028 "Seller contact email address" should contain exactly one @-sign, which should not be…
DE-R-001 An invoice shall contain information on "PAYMENT INSTRUCTIONS"
DE-R-002 The group "SELLER CONTACT" shall be provided
DE-R-003 The element "Seller city" shall be provided
DE-R-004 The element "Seller post code" shall be provided
DE-R-005 The element "Seller contact point" shall be provided
DE-R-006 The element "Seller contact telephone number" shall be provided
DE-R-008 The element "Buyer city" shall be provided

Frequently asked questions

What does DE-R-007 mean?

DE-R-007 is a peppol national rule: The element "Seller contact email address" (BT-43) shall be provided.

Will my invoice be rejected because of DE-R-007?

Yes. DE-R-007 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals, KSeF) reject the invoice until it is fixed.

Which formats does DE-R-007 apply to?

Only when the seller (or for some rules the buyer) is in the named country: the rule is triggered by the country code of the party. Dutch rules implement NLCIUS, German rules the XRechnung requirements inside Peppol. Syntax: UBL.

Source: Peppol BIS Billing 3.0.20 national rules (November 2025). Catalogue generated from the official rule sets on 2026-10-15.