Here is what Scola said on his Chinese blog. (yes... Scola has a chinese blog. Infact most Rockets do)
I spoke with our GM, Daryl Morey, about several topics, but in particular about the item I spoke about in a recent blog I wrote about the argument we had in our locker room about whether a coach could be traded…. He said they can be traded! I was completely surprised by that. I thought it was something silly that someone said that was completely unfounded, but it turns out to be true. Not only is it possible, but he gave me examples of when it has happened. One example of this which was actually pretty important was when Miami traded Stan Van Gundy to Orlando for a couple of draft picks a few years ago.
Turns out that they can also trade GM’s. The only difference between trading coaches and GM’s from trading players is that the coaches and GM’s can reject a trade if they don’t want to accept the move.
http://luis-scola.blog.sohu.com/144690975.html
This is certainly news to me..... You can even trade GMs? Wow.