Rule reference

BR-DEC-25 The allowed maximum number of decimals for the invoice line allowance base amount (BT-137) is 2, but lines[0].allowances[0].baseAmount is 10.005, which has 3

The allowed maximum number of decimals for the invoice line allowance base amount (BT-137) is 2, but lines[0].allowances[0].baseAmount is 10.005, which has 3. The constraint is on the serialised value, so it is about what reaches the XML rather than about what your variable holds — and the line is where over-precision starts, since every document total downstream of it inherits the drift. A base amount is normally lifted straight out of a subtotal your own system computed, so it carries whatever precision that computation left behind. It is also the number the percentage is applied to, so an over-precise base tends to produce an over-precise amount alongside it.

Business term

BT-137

Severity

fatal

What the library returns

The exact object in result.errors when this rule fires. Generated by running @attestwire/en16931, not transcribed:

{
  "rule": "BR-DEC-25",
  "field": "BT-137",
  "severity": "fatal",
  "message": "The allowed maximum number of decimals for the invoice line allowance base amount (BT-137) is 2, but lines[0].allowances[0].baseAmount is 10.005, which has 3. The constraint is on the serialised value, so it is about what reaches the XML rather than about what your variable holds — and the line is where over-precision starts, since every document total downstream of it inherits the drift. A base amount is normally lifted straight out of a subtotal your own system computed, so it carries whatever precision that computation left behind. It is also the number the percentage is applied to, so an over-precise base tends to produce an over-precise amount alongside it.",
  "fix": "Round lines[0].allowances[0].baseAmount to two decimals before assigning it (10.01 here). Use half-up rounding away from zero — this package exports round2(), which handles the cases Math.round and toFixed get wrong.",
  "example": "\"baseAmount\": 10.01",
  "xpath": "/ubl:Invoice/cac:InvoiceLine[1]/cac:AllowanceCharge[1]/cbc:BaseAmount",
  "docsUrl": "https://attestwire.com/rules/BR-DEC-25"
}

xpath locates the element in the generated UBL document, which is where a KoSIT or Peppol validator will report the same problem.

A passing value

"baseAmount": 10.01

The fix

Round lines[0].allowances[0].baseAmount to two decimals before assigning it (10.01 here). Use half-up rounding away from zero — this package exports round2(), which handles the cases Math.round and toFixed get wrong.

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