Displaying the Navigation Path (Stack) 
Use
The Stack editor function lists the subschemas, rules, and subrules that you have accessed since calling up the current schema within the display or change function for source text (navigation path).
Prerequisites
Procedure
You access the Navigation stack dialog box. It contains a list of all schemas and rules that you have accessed. The first entry in the list is the object you last accessed.
Result
You access the source text of the selected object.