How do I fix IS-R-009?

This requires user input to resolve. Provide the correct value for `cbc:DueDate` (BT-9). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.

Is IS-R-009 a critical error?

Yes, IS-R-009 is a critical error that will cause invoice rejection. It must be fixed before submission.

Can IS-R-009 be automatically fixed?

Many instances of IS-R-009 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-009`:Icelandic invoices with EINDAGI (final due date) must also have a regular...

Icelandic invoices with EINDAGI (final due date) must also have a regular due date (BT-9). The due date is required when EINDAGI is present.

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: Payment Due Date (BT-9)

What is IS-R-009?

IS-R-009 is a fatal validation rule defined in the CIUS-IS (Iceland) specification (ISL national rules). It checks whether icelandic invoices with eindagi (final due date) must also have a regular....

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.

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Why This Error Matters

Invoice will be rejected by Icelandic validation. Due date is required when EINDAGI is specified.

IS-R-009 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-009
·Specification: CIUS-IS (Iceland)

Before / After

Failing XML

<Invoice>
  <cbc:DueDate><!-- invalid or missing value --></cbc:DueDate>
</Invoice>

Corrected XML

<Invoice>
  <cbc:DueDate>correct-value</cbc:DueDate>
</Invoice>

Technical Reference

SpecCIUS-IS (Iceland)

StrategyRequires user input: Due date (BT-9). User must provide the invoice due date when EINDAGI is present.

Common Causes

·EINDAGI provided but due date missing
·Due date field not populated
·Supporting document added without main due date
·ERP does not link EINDAGI to due date requirement
·Manual addition of EINDAGI without due date

Seeing this in production? The API handles IS-R-009 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

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Handle IS-R-009 Automatically in Your Pipeline

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

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IS-R-009:Icelandic invoices with EINDAGI (final due date) must also have a regular...