In the code below..see the lines in BOLD..explanation is given as to why they are required
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Code----
selection-screen begin of block b1 with frame title text-001.
parameters: p_vbeln like vbak-vbeln.
selection-screen end of block b1.
selection-screen begin of block b2 with frame title text-002.
parameter: rb1 radiobutton group radi default 'X' user-command ucomm,
rb2 radiobutton group radi.
selection-screen end of block b2.
AT Selection-screen output.
if rb1 = 'X'.
Loop at screen.
if screen-name = 'P_VBELN'.
screen-input = '0'.
endif.
modify screen.
endloop.
else.
Loop at screen.
if screen-name = 'P_VBELN'.
screen-input = '1'.
endif.
modify screen.
endloop.
endif.
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Explanation----
If the user command is not given,the system will not trigger on the click of radio button..
Once triggered it comes to "At selection screen output"..where we must also mention the case when
radio button 2 is selected RB2 ..the p_vbeln must be input and when RB1 is selected the field
p_vbeln must be display only..Paste the code and see how it works
Then use the logic as desired...
Hope it helps
Regards,
Thiru.