I'm sorry, i should have been a little more clear on two things.
1. The center wall i need to only be passable when the player 'throws' the ball(holding a button to catch and releasing to throw,Still haven't figured this out, but it's the concept) , You can also simply run into the ball and it will bounce around , which brings me to my second point.
2. All of the objects in the scene that interact with the ball in some way are physics objects, mainly becuase that was the only way i could figure out how to get what i wanted working. Will simply changing the walls to solid in the middle work? If i want the ball to bounce off the middle wall when it bounces around, yet want it to be able to go over when thrown then surely it needs to be passable for the throw and impassable for the collision?
Thanks for such a quick reply by the way,Paul.