there are most confusing judgements on this point. According to my opinion the state commission can setaside the exparte passed by Dist Forums only. To setaside the exparte order of the state commssion you have to approach National Commission only.
As far as I know, I never heard such decision that a decree of District forum, to my knowledge the process of appeal against such decision to other appellate commission, and overruling of such decision of lower forum by higher forum is the only process I know. The query and replies are interesting and I am interested to know such new procedure.