How to attach or assign request set to responsibility

DECLARE
l_request_set_code VARCHAR2(40) := 'XX_REQ_SET_CODE';
l_appl_short_name VARCHAR2(3) := 'XXCOM';
l_request_group VARCHAR2(40) := 'XXCOM Receivables Billing';
l_req_appl_short_name VARCHAR2(40) := 'AR';
 

BEGIN

IF NOT fnd_set.set_in_group(request_set => l_request_set_code,
set_application => l_appl_short_name, --REQUEST SET APPLICATION SHORT NAME
request_group => l_request_group,---REQUEST GROUP NAME
group_application => l_req_appl_short_name--REQUEST GROUP APPLICATION SHORT NAME
) then

DBMS_OUTPUT.PUT_LINE ('Request Set not found, adding..');

fnd_set.add_set_to_group(request_set => l_request_set_code,
set_application => l_appl_short_name, --REQUEST SET APPLICATION SHORT NAME
request_group => l_request_group,---REQUEST GROUP NAME
group_application => l_req_appl_short_name--REQUEST GROUP APPLICATION SHORT NAME
);
else
dbms_output.put_line('"XX_REQ_SET_CODE" already added to request group ');
END IF;
dbms_output.put_line('"XX_REQ_SET_CODE" attached to request group Succesfully ');
COMMIT;

EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('Error in attaching "XX_REQ_SET_CODE" to Request Group ' || sqlerrm);
END;