Attestwire › Rule reference › BR-23

BR-23 Every invoice line must have a unit of measure code

noun · EN 16931 · fatal · BT-130

For a sample invoice, the library reports: Line 1 has no unit of measure code (BT-130). EN 16931 requires a code from UN/ECE Recommendation 20, not a free-text unit — "hours" is not valid, "HUR" is.

Business term

BT-130

Severity

fatal

The fix

Set line.unitCode to the UN/ECE Rec 20 code: "HUR" hours, "DAY" days, "C62" one/piece, "MTR" metres, "KGM" kilograms, "MON" months.

A passing value

"unitCode": "HUR"

What the library returns

The full error returned by @attestwire/en16931. It includes the rule ID, affected field and suggested correction. Developers can use this object in their application:

{
  "rule": "BR-23",
  "field": "BT-130",
  "severity": "fatal",
  "message": "Line 1 has no unit of measure code (BT-130). EN 16931 requires a code from UN/ECE Recommendation 20, not a free-text unit — \"hours\" is not valid, \"HUR\" is.",
  "fix": "Set line.unitCode to the UN/ECE Rec 20 code: \"HUR\" hours, \"DAY\" days, \"C62\" one/piece, \"MTR\" metres, \"KGM\" kilograms, \"MON\" months.",
  "example": "\"unitCode\": \"HUR\"",
  "xpath": "/ubl:Invoice/cac:InvoiceLine[1]/cbc:InvoicedQuantity/@unitCode",
  "docsUrl": "https://attestwire.com/rules/BR-23"
}

xpath is always a UBL path. On a CII invoice, look for the matching CII field instead.