How to change screen field value.

Hi Experts,
I like to change the screen field MSAUS(check box) of program SAPLIQS0 in one of the exit.But if I use
(SAPLIQS0)VIQMEL-MSAUS = 'X'. its showing compile error.Please tell me how can i change this field in this exit.
Regards,
Ajish.

try something like this:
create field symbol
FIELD-SYMBOLS: <fs>.
Assign value of variable from calling prog to field symbol
ASSIGN ('(SAPLIQS0)VIQMEL-MSAUS' ) TO <fs>.
<fs> = 'X'.
Regards,
ravi

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