Error with select option field validation in module pool

Hi experts,

I've a requirement with two screens of which first screen will have select option and some other fields and second screen will have table control.

Based on screen input data must be put in to table control of the second screen. I've declared selection screen and table control in the Top include and i have to do field validation for the first screen inputs which includes select option field validation also. For that i have used At selection screen event in the Top include.

But while activation it is showing following error.

Controls can only be defined only.(I have declared it in TOP include only)

There should only be definition in the (Top include) . Which means any sort of implementation is not meaningful.

Please help to do the field validations of the first screen.

Also at exit command module is not triggering with subscreen.

Regards,

Muthubalaji