Checking out and in

To make changes to dimensions, you must first check out the dimensions. If two users attempted to modify the same dimension at the same time, the changes made by the user who finishes first would be completely overwritten by the user who finishes later. To prevent this from occurring, a locking system exists that ensures changes are not made to the same structure at the same time by two different users. The procedure that locks a dimension is called a check out.