{
  "id": "BR-DEC-20",
  "country": "EU",
  "syntax": "ubl",
  "group": "decimal",
  "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 allowed maximum number of decimals for the VAT category tax amount (BT-117) is 2.",
  "statement_lang": "en",
  "context": "cac:TaxTotal/cac:TaxSubtotal",
  "test": "string-length(substring-after(cbc:TaxAmount,'.'))<=2",
  "meaning": "The VAT category tax amount (BT-117) may have at most 2 decimals. The statement says \"allowed maximum number of decimals\" and \"is 2\", and it ends with a period. It does not say shall. The context is cac:TaxTotal/cac:TaxSubtotal. This is a decimal limit, not the BR-46 presence check and not the BR-CO-17 calculation. The published test reads cbc:TaxAmount and writes <=2 with no space before <=. It does not call exists.",
  "fix": "Send the VAT category tax amount (BT-117) with at most 2 digits after the decimal point.",
  "example_fail": "A VAT category tax amount has 3 digits after the decimal point.",
  "example_pass": "That amount has 2 digits after the decimal point.",
  "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-DEC-20/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}