Retrieving variables between call programs

There are times when you want to access variables from a call program within a function module or user exit. Since...

you cannot define variables outside of the current program, try the following to complete this task.  

*Step 1: Assign the program/field name of calling program variable to field symbol 1
assign '(zcall_program_name)fname_from_call_program' to &ltfs1&gt. 


*Step 2: Assign field Symbol contents to field symbol  2
assign (&ltfs1>) to &ltfs2&gt.           


*Step 3: Assign Field Symbol 2 to avariable in the current function module/Program
vbak-vbeln = &ltfs2&gt.