Can we write in appointment letter that your Full and final settlement can be done after three(3) months?

In continuation of the post of learned Mr.Umakanthan, though it may not directly relevant to the query, a judgment passed by the SC in the matter of OT to managerial personnel (gist as attached) worth taking note of HR practitioners especially in Factories and to those the ID act would apply. I would like to know of any relevant issues recently decided in the matter.