Reg : GET_SELECTED_COLUMNS

Friends,

I have requirement where the user can select columns on ALV-display and then clicks a custom button,now i need to capture which columns were selected by the user and using this info i display another ALV in another screen.Till here its fine.

(I am capturing the columns user using method "GET_SELECTED_COLUMNS".)

But now when i am hitting back button on the 2nd ALV display screen and going back to initial display.here when i selecet some other combination of columns...and hit the custom button..this time the method is not giving the selected colums.The method is failing the second time.I have to litreally run the whole program again from the TCODE for it to strt working again.

I need help this is urgent.

Thanks and Regards,

Venkat.