Mandate field(s) on close

Mandate field(s) on close

I am trying to mandate fields be completed before the request is allowed to close.  I have tested a few rules I created using 'on create/edit - on field change 'status' = 'closed' - mandate fields XXX'.  I tested and I am able to close a request even if fields XXX are not filled in.  Is there a way to do this currently in Service Desk?  Thank you.

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