Peppol BIS Billing 3.0 · rule

IS-R-008

Layer peppol·Checked against Peppol BIS Billing 3.0 2026.5

What does IS-R-008 mean? If seller is icelandic and invoice contains supporting description EINDAGI then the id form must be YYYY-MM-DD — Ef seljandi er íslenskur þá skal eindagi (BT-122, DocumentDescription = EINDAGI) vera á forminu YYYY-MM-DD.

Why did my invoice fail IS-R-008?

If the seller is Icelandic and the invoice contains a supporting document reference (BT-122) with DocumentDescription EINDAGI (final due date), the reference ID must be a date in YYYY-MM-DD form. This Peppol BIS 3.0 Icelandic country rule fixes the format of the Icelandic 'eindagi' date carried through the additional document reference mechanism.

Official rule text

If seller is icelandic and invoice contains supporting description EINDAGI then the id form must be YYYY-MM-DD — Ef seljandi er íslenskur þá skal eindagi (BT-122, DocumentDescription = EINDAGI) vera á forminu YYYY-MM-DD.

Common causes

Date written as DD.MM.YYYY or another local format instead of YYYY-MM-DD
Non-date text placed in the EINDAGI reference ID

How do I fix it?

<cac:AdditionalDocumentReference>
  <cbc:ID>2026-08-15</cbc:ID>
  <cbc:DocumentDescription>EINDAGI</cbc:DocumentDescription>
</cac:AdditionalDocumentReference>

Check your invoice against this rule

Paste it into the live demo, or call POST /v1/validate. See the quickstart.