Fortnox error: 2003055

The error message occurs when exporting payments from the integration platform to Fortnox, indicating that the integration is attempting to record a payment on an invoice already marked as paid in Fortnox.

How to resolve the error

1. Check the payment status of the invoice in Fortnox

• Log in to Fortnox and navigate to Invoicing > Customer Invoices.
• Find the relevant invoice and verify its payment status.
• If the invoice is marked as paid, note the date and amount.

2. Check the payment in the integration platform

• Log in to the integration platform and go to the transaction causing the issue.
• Ensure that the payment information matches what is already recorded in Fortnox.
• If the payment is already registered in Fortnox, click 'Ignore' on the transaction in Issue Tracker to prevent it from being included in future exports.

3. Prevent duplicate registrations through automated routines

Cause:
The integration platform and Fortnox have parallel automated routines creating payments.

Solution:

• Ensure payments are only sent from either the integration platform or registered manually/directly in Fortnox, not both.
• Adjust routines so that payments originate from a single system.

Summary

To resolve error 2003055:

• Verify the invoice is already marked as paid in Fortnox.
• Check the payment in the integration platform and exclude it from future exports if it is already fully paid in Fortnox.
• Ensure payments are recorded from only one system to avoid duplicate entries.