What it means
When the seller is Icelandic and the invoice has an eindagi, the date in the EINDAGI reference (BT-122) must be the same as the due date (BT-9) or later. Both dates need to be in the form YYYY-MM-DD for the comparison to work, so if IS-R-008 is also reported, fix that first.
Why it matters
The eindagi is the final payment date and comes on or after the normal due date. If it sits before the due date, the payment terms contradict each other and the recipient cannot tell when the invoice is really late. The Icelandic rules treat this as an error and the invoice is rejected.
How to fix it
Compare the due date and the eindagi in your invoicing software and correct whichever one is wrong, so that the eindagi is the same day as the due date or later. A common cause is a due date that was moved later after the eindagi was set. In the XML the due date is cbc:DueDate and the eindagi is cbc:ID in the cac:AdditionalDocumentReference whose cbc:DocumentDescription is EINDAGI.
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-010 still fails, and which other rules do.
Related rules
- IS-R-009 An invoice with an Icelandic eindagi also needs a 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