Hi,
This is common error when you have radio button group on the selection screen.
Please note: if you make any of the input field as mandatory, it would allow your dynamic screen population on radio button selection, you will be keep getting error to enter the value.
Solution: 1. Don't make any field mandatory.
2. Validate selection input in START-OF-SELECTION, Rather AT-SELECTION SCREEN.
In this case as soon as you press F8, when START-OF-SELECTION, You may check for field is initial or not & throw error message.
Like:
START-OF-SELECTION
Pefrom sub_check_mandat_field.
form sub_check_mandat_field.
IF field1 IS Initial.
message 'Please enter value' TYPE 'E'
endif.
endform.
PS: Please reward if use full. Thanks!