Yes you can on sell, but normally this would require you to settle on the property, since you are the one who has paid the deposit and exchanged contracts with the developer. If you had purchased an option to buy the property, then this would be a different scenario, and perhaps more of what your were thinking?
I just joined the forum and saw this thread. What sort of information products are we allowed to buy swap or sell? I have a good few that are gathering dust that I am sure some people might find better use for than me.