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
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