BR-04 error
What this rule checks
Explanation
Every invoice must carry an Invoice type code (BT-3) — a coded value (e.g. 380 for a commercial invoice, 381 for a credit note) that tells the recipient's system what kind of document this is, independent of the document's file name or syntax.
How to fix it
Populate the type code element (UBL: cbc:InvoiceTypeCode; CII: ram:TypeCode under ExchangedDocument) with a valid code from the UNTDID 1001 invoice type code list — 380 for a standard invoice is the most common case.
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