Duplicate Invoice Created in Visma Net Despite Supplier Reference Restriction

[CharlotteJB1]

Hi,

We have encountered an issue where two balanced transactions were created in Visma Net for our customer Craftor AB. Both transactions had the same supplier reference, meaning they were linked to the same invoice in Medius.

Most likely, a system disruption caused the integration between Medius and Visma Net to time out, triggering the retry function, which resulted in the creation of a duplicate invoice. However, the problem is that Visma Net had already picked up the first invoice but did not communicate this back to Medius. As a result, two invoices were created in Visma Net, but only one exists in Medius. Invoice in Medius.

This should not be possible, as the customer has a setting in Visma Net that is supposed to prevent the creation of multiple invoices with the same supplier reference. In theory, Visma Net should detect that an invoice with the same supplier reference already exists and return an integration error to Medius instead of allowing the duplicate entry. However, this did not happen.

Request:
Could you investigate why this setting failed to block the second invoice from being created in Visma Net?

Thank you in advance for your support.