errorcountryISLCIUS-IS (Iceland)

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

Fix: This requires user input to resolve. Provide the correct value for `cbc:DueDate` (BT-9). Provide the required value in the free validator.

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).

When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.

Fix this error

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 — the invoice must be corrected and re-sent before it can reach the recipient.

Validator Behavior

  • ·Causes invoice rejection
  • ·Error returned: IS-R-009
  • ·Specification: CIUS-IS (Iceland)

How to Fix It

1.

Identify the missing data

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.

2.

Provide the required value

This requires user input to resolve. Provide the correct value for `cbc:DueDate` (BT-9).

3.

Re-validate your invoice

Upload the corrected invoice to confirm IS-R-009 is resolved.

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 →

Frequently Asked Questions

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.

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.

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

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.

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Last updated: 14 April 2026

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