Seeing list of entries in matchcode box...

Hi,

When I click on the parameter box inside the report, I see the match code box due to following:

selection-screen begin of block b1 with frame title text-001.

PARAMETERS: P_Object(20) Type C,

P_Objnum(20) Type C.

selection-screen end of block b1.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_Object.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_Objnum.

Now when I click on match code box I want to see the list of around 4 entries in the selection match code box.

How can I do this ?

Regards..