How to dynamic set default value to parameters?

Hi,
There are two parameters of radio buttons on the interface. I want to set default valuse to parameters according to sy-sysid. That is:
(1) if sy-sysid = 'S1'
     p1............. 'X'
     p2.............
(2)if sy-syid = 'S2'
     p1............
     p2............ 'X'
how to write the code?
Thanks

Create two vriable Data:
radio1(1),
radio2(1).
if sy-sysid = 'S1'.
clear radio2.
radio1 = 'X'.
else.
clear radio1.
radio2 = 'X'.
endif.
then pass this variables to intercace.
p1............. radio1
p2.............radio2.
Regards,
Gopi ,
reward points if helpfull.

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