IS-R-001:Icelandic suppliers can only issue invoice type 380 (invoice) or 381 (credit...
Fix: Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (IS-R-001). Upload your invoice to fix this automatically.
Icelandic suppliers can only issue invoice type 380 (invoice) or 381 (credit note). Other document types are not supported for Icelandic e-invoicing.
Engine Classification
Ensure Icelandic seller registration identifier is present
Confidence: 75% · Applied automatically in pipeline
What is IS-R-001?
IS-R-001 is a fatal validation rule defined in the CIUS-IS (Iceland) specification (ISL national rules). It validates the CompanyID element under Party > PartyLegalEntity in the UBL invoice XML.
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Target path: //cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:CompanyID
Why This Error Matters
Invoice will be rejected by Icelandic validation. Only standard invoices and credit notes are supported.
IS-R-001 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: IS-R-001
- ·Specification: CIUS-IS (Iceland)
How to Fix It
Find the missing or empty field
Check cbc:CompanyID at //cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:CompanyID. This field is required but is either missing or empty.
Set the required value
Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (IS-R-001).
Re-validate your invoice
Upload the corrected invoice to confirm IS-R-001 is resolved.
Before / After
<Invoice> <!-- Issue: If seller is Icelandic then invoice type should be 380 (invo --> </Invoice>
<Invoice> <!-- Issue resolved per CIUS-IS (Iceland) --> </Invoice>
Technical Reference
//cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:CompanyIDCommon Causes
- ·Wrong invoice type code used
- ·Proforma or other document type selected
- ·Invoice type not set correctly
- ·ERP default type not valid for Iceland
- ·Document type from non-Icelandic template
Seeing this in production? The API handles IS-R-001 automatically. See the fix response →
Frequently Asked Questions
Icelandic suppliers can only issue invoice type 380 (invoice) or 381 (credit note). Other document types are not supported for Icelandic e-invoicing.
Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (IS-R-001). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
Yes, IS-R-001 is a critical error that will cause invoice rejection. It must be fixed before submission.
Many instances of IS-R-001 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.
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Last updated: 14 April 2026
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