How to check if data has been changed

There is a system variable SY-DATAR. If any value is changed in the screen it will have 'X'.Otherwise it will be initial.

SY-DATAR is to be used along with a flag.

In PAI set flag using SY-DATAR.

ie

if sy-datar is not initial.
flag = 1.
endif.

Now in
Module exit_command..
if sy-datar is initial and flag is initial.
...
else.
.....
endif
endmodule


refer to:http://scn.sap.com/thread/787703