Official rule text
[BR-DEX-03] A Sub Invoice Line (BG-DEX-01) must contain exactly one "SUB INVOICE LINE VAT INFORMATION" (BG-DEX-06).
Official text (German): Eine Sub Invoice Line (BG-DEX-01) muss genau eine "SUB INVOICE LINE VAT INFORMATION" (BG-DEX-06) enthalten.
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[$isExtension]Test (XPath):
not(exists(//cac:SubInvoiceLine/cac:Item[ count ( cac:ClassifiedTaxCategory) != 1]))Check your invoice
Drop your XML or PDF on the validator and every failed rule is linked to its page here. Free, no account, the file is not stored.
Same check via API:
curl -F file=@invoice.xml https://einvoicechecker.com/v1/validateRelated rules
BR-DEX-01The element … "Attached Document" uses a MIME code that is not permittedBR-DEX-02The value of "Invoice line net amount" of an "INVOICE LINE" or a "SUB INVOICE LINE"…BR-DEX-04Any scheme identifier in … MUST be coded using one of the ISO 6523 ICD listBR-DEX-05Any scheme identifier in … MUST be coded using one of the ISO 6523 ICD listBR-DEX-06Any scheme identifier in … MUST be coded using one of the ISO 6523 ICD listBR-DEX-07Any scheme identifier for an Endpoint Identifier in … MUST belong to the CEF EAS code…BR-DEX-08Any scheme identifier for a Delivery location identifier in … MUST be coded using one…BR-DEX-09Amount due for payment = Invoice total amount with VAT - Paid amount + Rounding amount…
Frequently asked questions
What does BR-DEX-03 mean?
BR-DEX-03 is a xrechnung rule: A Sub Invoice Line (BG-DEX-01) must contain exactly one "SUB INVOICE LINE VAT INFORMATION" (BG-DEX-06).
Will my invoice be rejected because of BR-DEX-03?
Yes. BR-DEX-03 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals) reject the invoice until it is fixed.
Which formats does BR-DEX-03 apply to?
XRechnung in UBL or CII syntax, including ZUGFeRD / Factur-X PDFs with the XRECHNUNG profile. Invoices to German public authorities (federal, state and municipal) must pass it. Syntax: UBL.
Source: XRechnung 3.0.2, schematron 2.6.0 (KoSIT, September 2026). Catalogue generated from the official schematron on 2026-10-14.