Remove Item from Sales Order with a Wave

User needs to remove an item line from a Sales Order with a related wave. This cannot be done even if the Pick Task of the affected item is marked as Done or deleted as well as if the Wave is completed. Doing so triggers the system to throw an error. 

Solution

1. Click Edit on the affected Sales Order
2. Click Items tab
3. Closed Column Checkbox: Enter checkmark for the affected item
4. Click Save