Yeah collisions only work one way so you'd also have to include the line :-
Collisions ROOM,CAM,2,2
Also the object you are checking for collisions must be moving. If it is stationary and something moves into it then a collision will not be registered.
Collisions ROOM,CAM,2,2
Also the object you are checking for collisions must be moving. If it is stationary and something moves into it then a collision will not be registered.