This is a feature that already exists when you use the "Compare and Edit" function of a CAM operation - when a field is selected, the result is replaced with the expression it was derived from, making for quicker edits. However, in the standard interface, i.e. using the "Edit" feature of a CAM operation, when you click a field the result remains, and the user is unaware that the resultant value may have been derived from an expression. Currently the user is forced to right click and "Edit Expression" of every field just to see where values are coming from.