"The prosecution is at liberty to examine the applicant (Wadia) as prosecution witness and if the prosecution has no desire to do so then the applicant will be examined as the court witness," said special judge A D Karanjkar in an order passed last week.
On May 26, Wadia will have to inform the court the date in June when he would appear before the court.
One Kirti Ambani is the accused in this attempt to murder case.
His evidence was necessary to throw light on the motive behind the crime, Wadia added.