{
  "id": "BR-27",
  "country": "EU",
  "syntax": "ubl",
  "group": "document",
  "severity": "fatal",
  "severity_note": "fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.",
  "spec": "Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL",
  "statement": "The Item net price (BT-146) shall NOT be negative.",
  "statement_lang": "en",
  "context": "cac:InvoiceLine | cac:CreditNoteLine",
  "test": "(cac:Price/cbc:PriceAmount) >= 0",
  "meaning": "The item net price (BT-146) must not be negative. The official message capitalizes NOT. It does not say \"shall be provided\". The published test checks that the price amount is greater than or equal to zero. The comparison has spaces around >=. The test has no space before the closing parenthesis. The context is the invoice line or the credit note line.",
  "fix": "Set the item net price (BT-146) to zero or a positive amount.",
  "example_fail": "The price amount is less than zero.",
  "example_pass": "The price amount is zero or greater.",
  "example_note": "Illustration of the condition in the official statement. Not an example published by the source.",
  "source_url": "https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/BR-27/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}