ALV GRID

HI ALL,

i using ALV grid to display my out, my sequence is as follows,

i have a <b>Button X</b> on tab page when i click on X i display a screen where i have some selection criteria when user enters a value and clicks on display button it shows the output in ALV .

I am able to show the output and when user make changes i am able to save it in my dbase.

Problem: when i click a back button on my screen it goes on to the tabpage but again i click <b>Button X</b> and go to the screen i get the old data displayed on the screen, which is not required.

How can i refresh avoid that?

Regards.<b></b>