What it means
The invoice currency code (BT-5) must be a valid ISO 4217 code: three capital letters, such as EUR, USD or GBP.
Why it matters
Codes are read by software, not by people. A value outside the agreed code list cannot be interpreted, so the recipient's system rejects the invoice even when the value looks sensible to a person.
How to fix it
Choose the invoice currency from the list in your invoicing software rather than typing it, and export again. If you build the XML yourself, write the code in capitals, for example EUR in cbc:DocumentCurrencyCode (UBL) or ram:InvoiceCurrencyCode (CII).
The rule as published
Invoice currency code MUST be coded using ISO code list 4217 alpha-3 Where this rule applies
| Rule set | Version |
|---|---|
| EN 16931 (UBL) | 1.3.17 |
| EN 16931 (UBL credit note) | 1.3.17 |
| EN 16931 (CII) | 1.3.17 |
| XRechnung 3.0 (UBL) | 3.0.2 |
| XRechnung 3.0 (UBL credit note) | 3.0.2 |
| XRechnung 3.0 (CII) | 3.0.2 |
| Peppol BIS Billing 3.0 (invoice) | 2026.5 |
| Peppol BIS Billing 3.0 (credit note) | 2026.5 |
| SI-UBL 2.0 / NLCIUS (invoice) | 2.0.3.13 |
| SI-UBL 2.0 / NLCIUS (credit note) | 2.0.3.13 |
| NLCIUS (CII) | 1.0.3.13 |
| France CTC (UBL invoice) | 1.4.0-04 |
| France CTC (UBL credit note) | 1.4.0-04 |
| France CTC (CII) | 1.4.0-04 |
| CIUS-RO UBL Invoice 1.0.9 | 1.0.9 |
| CIUS-RO UBL Credit Note 1.0.9 | 1.0.9 |
Check your file
Drop your e-invoice to see whether BR-CL-04 still fails, and which other rules do.
Related rules
- BR-CL-05 The VAT accounting currency must be a valid ISO 4217 code
- BR-CL-06 The VAT point date code must be 3, 35 or 432
- BR-CL-07 The invoiced object scheme must come from UNTDID 1153
- BR-CL-08 A note subject code must come from UNTDID 4451
- BR-CL-10 Party identifiers must use an ISO 6523 scheme
- BR-CL-11 Legal registration numbers must use an ISO 6523 scheme