Repeat a Script Function?

[Mudbill]

You can try ResetProp("CannonBall");

If that doesn't work, you can try to CreateEntityAtArea("CannonBall", "cannonball.ent", "Area", false);

The parameters are internal name, entity file, area name, full game save. The last one can be changed to true, in which case it will save your cannonball's location when you re-enter the level. If you don't need it, don't use it.