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BR-DE-6

The contact telephone number (BT-42) is missing or empty

Validation rule of XRechnung 3.0.2 (KoSIT, Schematron 2.6.0) · Level: Error

What the message means

The contact telephone number (BT-42) is missing or empty.

What the issuer needs to change

Give a complete telephone number for the contact.

Fields concerned

BT-42 seller contact telephone number

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Origin

Rule set: XRechnung 3.0.2 (KoSIT, Schematron 2.6.0)
Syntax: CII, UBL
Level: Error

Original rule text

Das Element "Seller contact telephone number" (BT-42) muss übermittelt werden.

Source: KoSIT, XRechnung Schematron 2.6.0, Apache License 2.0

Technical details for IT

UBL

Context: /ubl:Invoice/cac:AccountingSupplierParty/cac:Party/cac:Contact | /cn:CreditNote/cac:AccountingSupplierParty/cac:Party/cac:Contact
Test: not(cbc:Telephone[boolean(normalize-space(.))])

CII

Context: /rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:DefinedTradeContact
Test: not(ram:TelephoneUniversalCommunication/ram:CompleteNumber[boolean(normalize-space(.))])

Related rules

BR-DE-3Missing: seller city (BT-37)
BR-DE-4Missing: seller post code (BT-38)
BR-DE-5Missing: seller contact point (BT-41)
BR-DE-7The contact email address (BT-43) is missing or empty
BR-DE-8Missing: buyer city (BT-52)
BR-DE-9Missing: buyer post code (BT-53)

All validation rules

Technical explanation by robin.vision, not tax or legal advice. Rules as of 31 August 2026 (KoSIT validator configuration).