Radiobutton group with parameters

Hi,

I've a set of Radiobutton groups in my selection screen.

On clicking one particular radio button group, two parameter fields will be displayed for that radio button.

Out of the two parameters , user has to enter atleast one to execute the program.

If the user didnt enter anything and hit execute then an error message should be displayed to "Enter atleast one"

if the user enters anyone of the field, then validation should happen for that field alone to check whether he entered right data or not?

In which event I can right this, I have tried in at-selection screen and at selection screen on paramter and at selection screen on radhio button group g1.But not able to resolve.

Experts, any thoughts?

Thanks in adv.

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Regards.

Ponraj.s.

Edited by: Julius Bussche on Sep 10, 2009 8:47 AM