Student or Learner
I can't revise this location
I am not able to revise this location.
But "I can't" and "I am not able to" have the same meaning, and there are two possibilities.
1. It is physically, technically or otherwise impossible for me to do.
2. I am uwilling or not allowed to do it.
I still can't get the meaning with either possibility.
So did I. I just assumed that he knew what he was talking about. If he is unable to do it, he can't do it.
I suppose he'll now post something that will prove me wrong! But that's covered by 2006's post.