Delete Parnet Type of Asset

Delete Parnet Type of Asset

Hi Dears
I make a CI Type and then Choose Parent Type for my CI.as now i want to delete its parent and choose no parent for this CI.
how i can bring this CI to the root??
there is just choose  another CI as a parent type but i dont want it.
Please help me
im using sdp version 8.2,also i test it in the 9.1 but doesnt work.
Thanx Dears
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