How to prevent AT SELECTION-SCREEN event on second Selection Screen

Hi All
I have a program in which I am entering some parameters in a selection screen and also validating them in AT SELECTION-SCREEN events. After validating them the program shows another selection screen in which I have some push-buttons. I have some events on those push-buttons also.
However I am facing a different problem now. When I execute the second selection screen I get the report, and when I click on back button then it again triggers the AT SELECTION SCREEN event of the first selection screen and displays the related messages.
How to prevent this ? Is there any way where I can restrict the execution of selection screen events for a particular selection screen?
Amol

Hi,
    try this logic when Ist selection screen validation
     is done set a flag = 'X' .
      at selection-screen.
      if glag is initial
       *screen validation
           flag = 'X..
      endif.
regards
amole

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How to prevent AT SELECTION-SCREEN event on second Selection Screen

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