How to add a new concurrent program with Custom Request Group through script

DECLARE

BEGIN

FND_PROGRAM.ADD_TO_GROUP
   (
    PROGRAM_SHORT_NAME  =>'CONA_CREDITORS_LEDGERS'
   ,PROGRAM_APPLICATION =>'XXILL'  --XXILL Custom Application
   ,REQUEST_GROUP       => 'XXILLCUSTOM'
   ,GROUP_APPLICATION   =>'XXILL'
   ) ;
Commit;
Exception
     when others then
     dbms_output.put_line('Object already exists');
END ;
/