{
  "id": "BR-DE-15",
  "country": "DE",
  "syntax": "ubl",
  "group": "xrechnung",
  "severity": "fatal",
  "severity_note": "fatal, from the schematron flag attribute on tag v2.6.0.",
  "spec": "XRechnung Schematron 2.6.0 (itplr-kosit/xrechnung-schematron tag v2.6.0), UBL invoice and credit note",
  "statement": "[BR-DE-15] Das Element \"Buyer reference\" (BT-10) muss übermittelt werden.",
  "statement_lang": "de",
  "context": "/ubl:Invoice | /cn:CreditNote",
  "test": "cbc:BuyerReference[boolean(normalize-space(.))]",
  "meaning": "The element \"Buyer reference\" (BT-10) must be transmitted. The published test requires cbc:BuyerReference to contain something other than whitespace.",
  "fix": "Send a non-empty buyer reference in BT-10 (cbc:BuyerReference).",
  "example_fail": "BT-10 is absent, or cbc:BuyerReference is empty or only spaces.",
  "example_pass": "cbc:BuyerReference contains a non-empty buyer reference.",
  "example_note": "Illustration of the condition in the official statement. Not an example published by the source.",
  "source_url": "https://github.com/itplr-kosit/xrechnung-schematron/blob/v2.6.0/src/validation/schematron/ubl/XRechnung-UBL-validation.sch",
  "source_retrieved": "2026-10-17",
  "last_verified": "2026-10-17"
}