Modifying the selection screen dynamically

Question

Hey folks,
I have posted this question previously but no one understood the real problem.
I have 4 fields
Company Code
material Number
plant
storage Location
Unit
when I select the company code AA01 from the F4 help I want to disable material number and Plant ..Like this i have 4 scenarios where based upon the input given in the selection screen other fields have to be enabled or disabled.
I have already used at selection screen on output but that doesn't help me as its a PBO event I tried to search for a proper event but cudn't find it. Is there any way i can achieve this. A sample code wud be easy for me to understand .
Thanks in advance
Rock

Answer 1

Set different groups in your fieds on the screen.
Set the screen group for the Material and Plant as the GR1
Set the screen gorup for the Storage location as the GR2.
You need to modify your screen fields on the PBO event.
Like:
IF P_BUKRS = 'AA01'.
loop at screen.
   if screen-group1 = 'GP1'.
     screen-input = 0.
     modify screen.
   elseif screen-group2 = 'GP2'. 
     screen-input = 1.
     modify screen.
   endif.
endloop. 
else.
loop at screen.
   if screen-group1 = 'GP2'.
     screen-active = 0.
     modify screen.
   elseif screen-group2 = 'GP1'. 
     screen-input = 1.
     modify screen.
   endif.
endloop. 
endif.
Regards,
Naimesh Patel