IS-R-005:When both seller and buyer are Icelandic, the buyer's address must include...
Fix: This requires user input to resolve. Review the relevant cbc: and cac: elements in your Invoice XML and provide the correct value. (IS-R-005). Provide the required value in the free validator.
When both seller and buyer are Icelandic, the buyer's address must include street name and postal code. Complete address is required for domestic transactions.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: Buyer Street Name, Buyer Postal Code
What is IS-R-005?
IS-R-005 is a fatal validation rule defined in the CIUS-IS (Iceland) specification (ISL national rules).
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Why This Error Matters
Invoice will be rejected by Icelandic validation. Domestic transactions require complete buyer address.
IS-R-005 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: IS-R-005
- ·Specification: CIUS-IS (Iceland)
How to Fix It
Identify the missing data
When both seller and buyer are Icelandic, the buyer's address must include street name and postal code. Complete address is required for domestic transactions.
Provide the required value
This requires user input to resolve. Review the relevant cbc: and cac: elements in your Invoice XML and provide the correct value. (IS-R-005).
Re-validate your invoice
Upload the corrected invoice to confirm IS-R-005 is resolved.
Before / After
<Invoice> <!-- Issue: When both seller and buyer are Icelandic, the buyer address --> </Invoice>
<Invoice> <!-- Issue resolved per CIUS-IS (Iceland) --> </Invoice>
Technical Reference
Common Causes
- ·Buyer street name missing
- ·Buyer postal code not provided
- ·Incomplete buyer address for domestic invoice
- ·Customer address not fully populated
- ·Address fields not mapped in export
Seeing this in production? The API handles IS-R-005 automatically. See the fix response →
Frequently Asked Questions
When both seller and buyer are Icelandic, the buyer's address must include street name and postal code. Complete address is required for domestic transactions.
This requires user input to resolve. Review the relevant cbc: and cac: elements in your Invoice XML and provide the correct value. (IS-R-005). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
Yes, IS-R-005 is a critical error that will cause invoice rejection. It must be fixed before submission.
Many instances of IS-R-005 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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