IS-R-008fatal
How to fix IS-R-008
If seller is icelandic and invoice contains supporting description EINDAGI then the id form must be YYYY-MM-DD
What this rule checks
When an Icelandic supplier includes an EINDAGI (final due date) as a supporting document description, the associated ID must be a valid date in YYYY-MM-DD format.
How to fix it
Set the ID of the AdditionalDocumentReference with DocumentDescription "EINDAGI" to a date in YYYY-MM-DD format, e.g., "2026-03-15".
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