How to 'Gray Out ' Parameter field

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Hi All,
Please help how to grey out this parameter.
i need when i tick p_3m,
parameter p_3mrp active, else parameter p_3mrp is grey.
Thank you.

   IF p_3m = 'X'.
      IF screen-name = 'P_3MRP'.
        screen-input = 1.
      ELSE.
        screen-input = 0.
    ENDIF.
   ENDIF.