How do I fix IS-R-005?

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.

Is IS-R-005 a critical error?

Yes, IS-R-005 is a critical error that will cause invoice rejection. It must be fixed before submission.

Can IS-R-005 be automatically fixed?

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.

errorISLCIUS-IS (Iceland)

`IS-R-005`:When both seller and buyer are Icelandic, the buyer's address must include...

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.

Severity

Fatal

Rule set

CIUS-IS (Iceland)

Country

ISL

Fix type

INPUT REQUIRED

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). It checks whether when both seller and buyer are icelandic, the buyer's address must include....

When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.

Get API Access Test This Error ↓

Why This Error Matters

Invoice will be rejected by Icelandic validation. Domestic transactions require complete buyer address.

IS-R-005 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.

Validator Behavior

·Causes invoice rejection
·Error returned: IS-R-005
·Specification: CIUS-IS (Iceland)

Before / After

Failing XML

<Invoice>
  <!-- Issue: When both seller and buyer are Icelandic, the buyer address  -->
</Invoice>

Corrected XML

<Invoice>
  <!-- Issue resolved per CIUS-IS (Iceland) -->
</Invoice>

Technical Reference

SpecCIUS-IS (Iceland)

StrategyRequires user input: Buyer street name (BT-50) and postal code (BT-53). User must provide complete buyer address.

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 →

Related Errors

IS-R-002

Icelandic suppliers must provide their Icelandic legal ID (kennitala). This...

IS-R-003

Icelandic suppliers must provide complete address with street name and...

IS-R-004

When both seller and buyer are Icelandic, the buyer's kennitala must be...

Last updated: 27 February 2026

Share this guide:

Handle IS-R-005 Automatically in Your Pipeline

The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.

Get API Access View API Documentation

IS-R-005:When both seller and buyer are Icelandic, the buyer's address must include...