Hi Mohd Lari,
Yes I know that this control check is missing from IM Provisioning Manager UI.
I think this control should exist in IMPM.
Anyway you can remove this control from IM User Console.
As you guessed, it is into the Validation JavaScript of the Standard Profile Screen with Tag=ModifyActiveDirectoryAccountExchangeGeneralUser.
This is a read-only screen. You cannot edit it, but you can make a copy of this screen and make modifications to the new screen.
So copy this screen to your custom one and from this new selected screen remove the Validation JavaScript.
Again, for the reason I mentioned previously this is not the right way.
BR,
Philippe.