Official rule text
[BR-DEX-15] This CII file might use the concept of Sub Invoice Lines. However XRechnung does not support this.
Why this error occurs
The validator evaluates the XPath test above against the context element; the assertion is false for your file.
How to fix it
Compare your file with the rule text and the test expression, adjust the element named in the context, and validate again.
What the validator checks
Checked element (context):
CII
/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:IncludedSupplyChainTradeLineItem/ram:AssociatedDocumentLineDocument[$isExtension]Test (XPath):
not(exists(//ram:ParentLineID))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-03A Sub Invoice Line must contain exactly one "SUB INVOICE LINE VAT INFORMATION"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…
Frequently asked questions
What does BR-DEX-15 mean?
BR-DEX-15 is a xrechnung rule: This CII file might use the concept of Sub Invoice Lines. However XRechnung does not support this.
Will my invoice be rejected because of BR-DEX-15?
No. BR-DEX-15 is a warning: the invoice is accepted but the recipient sees the notice. Fix it anyway, warnings often become errors in later rule versions.
Which formats does BR-DEX-15 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: CII.
Source: XRechnung 3.0.2, schematron 2.6.0 (KoSIT, September 2026). Catalogue generated from the official schematron on 2026-10-14.