einvoice / EN 16931 / XRechnung rule reference

BR-DEX-03

What this rule means and how to fix it

A SUB INVOICE LINE (BG-DEX-01) must carry exactly one SUB INVOICE LINE VAT INFORMATION (BG-DEX-06) — i.e. its Item must have exactly one cac:ClassifiedTaxCategory. Fires if any sub-line item has 0 or >1.

Eine Sub Invoice Line (BG-DEX-01) muss genau eine "SUB INVOICE LINE VAT INFORMATION" (BG-DEX-06) enthalten.

Deutsche Fassung: Amtlicher KoSIT-Text (official KoSIT assert text).

Requires
a SUB INVOICE LINE (BG-DEX-01) must carry exactly one SUB INVOICE LINE VAT INFORMATION (BG-DEX-06) — i.e. its Item must have exactly one cac:ClassifiedTaxCategory. Fires if any sub-line item has 0 or >1.
Business terms
BG-DEX-01 BG-DEX-06
Syntax
Binds the UBL-2.1 Invoice / CreditNote syntax
Location (UBL-2.1 path)
cac:SubInvoiceLine/cac:Item
Fix
Add the required element at `cac:SubInvoiceLine/cac:Item`: a SUB INVOICE LINE (BG-DEX-01) must carry exactly one SUB INVOICE LINE VAT INFORMATION (BG-DEX-06) — i.e. its Item must have exactly one cac:ClassifiedTaxCategory. Fires if any sub-line item has 0 or >1.
Fix (Deutsch)
Ergänzen Sie das erforderliche Element bei `cac:SubInvoiceLine/cac:Item`: Eine Sub Invoice Line (BG-DEX-01) muss genau eine "SUB INVOICE LINE VAT INFORMATION" (BG-DEX-06) enthalten.
Severity
fatal
Provenance source
xrechnung-ubl
Provenance assert

Eine Sub Invoice Line (BG-DEX-01) muss genau eine "SUB INVOICE LINE VAT INFORMATION" (BG-DEX-06) enthalten.

The Location above is a UBL-2.1 path, and no UN/CEFACT-CII path for this rule is published here; Fix and Fix (Deutsch), verbatim from remediation_catalog.json and not reworded here; the UBL-2.1 binding of this rule is differentially proven against the official KoSIT XRechnung 2.5.0 (XRechnung 3.0.2) Schematron.

Where to check the fix: paste the corrected invoice into the browser validator at /einvoice/validate/ — it runs this same engine locally in your browser, with no upload, and stops reporting BR-DEX-03 once the edit lands.

Korrektur prüfen: Laden Sie die geänderte Rechnung in den Browser-Validator unter /einvoice/validate/ — er führt dieselbe Engine lokal im Browser aus, ohne Upload, und meldet BR-DEX-03 nicht mehr, sobald die Korrektur greift.

The same invoice, failing and fixed

No vendored test suite ships a labelled example for this rule, so this pair was found rather than written. The engine was run over the vendored instance corpus/xrechnung-testsuite/src/test/business-cases/extension/04.01a-INVOICE_ubl.xml under --profile xrechnung, then re-run over the same file with one mechanical edit applied to one element, over and over, until the edit below changed the verdict: the whole ClassifiedTaxCategory group was deleted, with every element inside it. The page publishes it because the engine reported BR-DEX-03 for the edited document and did not report it for the untouched one.

UBL Invoice (XRechnung extension) — fails

The vendored file around the change, verbatim:

<cac:Item>
  <cbc:Name>Demontage Sanitär</cbc:Name>
</cac:Item>

UBL Invoice (XRechnung extension) — passes

The same lines as 04.01a-INVOICE_ubl.xml actually ships them — this block is the fix for the block above:

<cac:Item>
  <cbc:Name>Demontage Sanitär</cbc:Name>
  <cac:ClassifiedTaxCategory>
    <cbc:ID>S</cbc:ID>
    <cbc:Percent>19</cbc:Percent>
    <cac:TaxScheme>
      <cbc:ID>VAT</cbc:ID>
    </cac:TaxScheme>
  </cac:ClassifiedTaxCategory>
</cac:Item>

What the engine reports for the edited invoice

{
  "element": "cac:SubInvoiceLine/cac:Item/cac:ClassifiedTaxCategory",
  "field": "cac:SubInvoiceLine/cac:Item/cac:ClassifiedTaxCategory",
  "fix_hint": "Add the required element at `cac:SubInvoiceLine/cac:Item`: a SUB INVOICE LINE (BG-DEX-01) must carry exactly one SUB INVOICE LINE VAT INFORMATION (BG-DEX-06) — i.e. its Item must have exactly one cac:ClassifiedTaxCategory. Fires if any sub-line item has 0 or >1.",
  "location": "cac:SubInvoiceLine/cac:Item",
  "message": "A SUB INVOICE LINE (BG-DEX-01) must contain exactly one SUB INVOICE LINE VAT INFORMATION (BG-DEX-06).",
  "rule": "BR-DEX-03",
  "severity": "fatal",
  "terms": [
    "BG-DEX-01",
    "BG-DEX-06"
  ],
  "title": "A SUB INVOICE LINE (BG-DEX-01) must carry exactly one SUB INVOICE LINE VAT INFORMATION (BG-DEX-06) — i.e. its Item must have exactly one cac:ClassifiedTaxCategory. Fires if any sub-line item has 0 or >1."
}

Rule ids the engine reports for 04.01a-INVOICE_ubl.xml untouched: none. After the edit, BR-DEX-03 is reported that was not before.

Two honest limits. This is an edit that provokes the rule, not the only one, and it is not a claim about how real exporters break it. And it is the reverse of the fix a reader needs: the passing block is the vendored file's own content, which is what a conformant invoice looks like here.

Reproduce it yourself: take corpus/xrechnung-testsuite/src/test/business-cases/extension/04.01a-INVOICE_ubl.xml from this repository, apply the one edit named above, and run einvoice validate 04.01a-INVOICE_ubl.xml --profile xrechnung --format json, or paste the file into the browser validator, which runs this same engine locally with no upload.

Everything here is free and open source — pick up whatever helps, at your own pace: