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Finance | Project Operations, Human Resources, ...
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“An item with the same key has already been added” when generating Pick List for Shipment

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Hi everyone,

I am facing an issue in Dynamics 365 Finance and Operations (D365 F&O) while generating a Pick List for a Shipment.

When I open a shipment and try to generate the Pick List, I receive the following error:

An item with the same key has already been added.

The error appears on the WHSShipmentDetails form.

I am not getting any additional details or stack trace from the Infolog. When I look at the message information, it only shows:

Form Name: WHSShipmentDetails

I have attached a screenshot of the error.

Scenario

The issue occurs when doing the following:

  1. Go to Warehouse management → Shipments → All shipments

  2. Open the affected shipment.

  3. From the shipment, generate the Pick List.

  4. The process fails with:

    “An item with the same key has already been added.”


    I made some customizations to the report and later removed them to verify that the standard report runs correctly. However, the same error still occurs, and I am unable to even extend the report.

Screenshot 2026-09-10 175225.png
Screenshot 2026-09-09 174056.png
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  • Martin Dráb Profile Picture
    240,827 Most Valuable Professional on at

    You mentioned you made some customization, therefore you have a development environment and can use the debugger to find out where the error comes from. You aren't limited to what you see in user interface.

     

    Also, please explain why you aren't able to extend the report.

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