invalid item list; item !SL is in error

    Explanation: This message indicates the dfg_list or sch_
    list parameter to DFG$DEFRAGMENT was incorrectly formatted
    or logically invalid. It provides the item number that was
    incorrect. Associated messages indicate further errors.

    User Action: If the call to DFG$DEFRAGMENT was from HP supplied
    software, submit an SPR. Otherwise, correct the calling program.