What it means
When the seller is Icelandic and the invoice has an additional document reference with the description EINDAGI (BT-122), the invoice must also have a due date (BT-9). The final payment date only makes sense next to the due date, so it cannot stand alone.
Why it matters
The eindagi has to be compared with the due date, and it must not be earlier (see IS-R-010). Without a due date the recipient cannot make that comparison, so the Icelandic rules treat the invoice as incomplete and reject it.
How to fix it
Set a due date on the invoice in your invoicing software, in the due date or payment terms field. In the XML it is cbc:DueDate in the invoice. If you did not mean to give a final payment date, remove the EINDAGI reference instead.
The rule as published
Read the rule on the publisher's site
Business terms: BT-9, BT-122
Where this rule applies
| Rule set | Version |
|---|---|
| Peppol BIS Billing 3.0 (invoice) | 2026.5 |
| Peppol BIS Billing 3.0 (credit note) | 2026.5 |
Check your file
Drop your e-invoice to see whether IS-R-009 still fails, and which other rules do.
Related rules
- IS-R-010 The Icelandic eindagi cannot be earlier than the due date
- BR-52 Document reference is required
- BR-CO-25 A positive amount due needs a due date or payment terms
- BR-FR-CO-07_BT-9 The due date cannot be before the invoice date
- BR-FR-CO-09_BT-23-3 An already-paid invoice needs a due date
- BR-RO-DT003 Due date must be written as YYYY-MM-DD