screen variables clearing based on condition

Hi all,

       i had a selection screen in my program, along with radio buttons and a check box. Now i need to clear all the scree variables based on the selection criteria(radio buttons and check box).

      For that i had cleared the screen variable in At selection screen output event. but my problem is, After inputting the input fields if i am choosing any radio button or check box the inputted values from the input fields are clearing.

    My aim is to clear the inputted values only after executing the program and inputted values should not clear while choosing a radio button or check box.

how to achieve this ?