Currently it is not possible to change a unit test it’s linked object. I would very much like a feature that allows me to change the object of a unit test. I can image that you are not allowed to change the object type.
When do you need such a feature. For example if you split up a table into 2 tables. Or when you create a view of a table and you would like to also include unit tests from this table to be copied to this his new view.
Or when you have to copy/split up a task. You would like to copy units or move them to the newly create task(s).
It can also be very usefully when you only find out during running the unit test that you have linked to the incorrect object.
As to be expected the output and input columns/parameters can only be preserved when they exists in the new object.