To run a procedure from sql developer

Declare

    l_errbuf varchar2(100):= 'No error';

    l_retcode number:= 0;

begin

    dbms_output.put_line('Start of script');

    xxcus.xxabc_pkg.SendOrder (l_errbuf, l_retcode, 1299, 1420042);

    dbms_output.put_line('End of Script');

commit;

end;