Hi @FridaKånäs ,

As per the solution provided from a similar case, please refer the below information:

This warning message is correctly displayed when trying to release the customer order. The reason is that the shipment is not required as none of the items being reserved and picked are located on the same site as where the shipment would be created (in line with the shipment type used (example NR or AR). 

If the user is presented with the warning message, they should return to the Customer Order> Delivery Information tab and change the shipment type to NA, (or a non-automatic shipment type). Save the change and release the customer order again. This time the release should go through without triggering any warnings.

Please check this and see whether this is a feasible solution in your scenario.

Hope this helps!

Thanks.