SetSymbolSecRep didnot work?

I try to use aucOpExecSheetSetSymbolSecRepFlag to set Symbol as SecRep.
But the code didnot work.

I don't know why, I really appreciate your help.

public static void SetSecondaryRep(EB.Sheet drawingSheet, string symbolID)

        {

            if (drawingSheet.IsOpened == false)

                drawingSheet.Open(EB.SheetOpenBehavior.AutoSave);

            IList<EB.ExecuteSheetOperationRecordData> data = new List<EB.ExecuteSheetOperationRecordData>()

            {

                new EB.ExecuteSheetOperationRecordData()

                {

                     Qualifier=(int)EB.ExecuteSheetOperationModes.ExecSheetSetSymbolSecRepFlag,

                      Value=0

                },

                new EB.ExecuteSheetOperationRecordData()

                {

                     Qualifier=(int)EB.ExecuteSheetOperationModes.ArgExecSheetRef2Symbol,

                      Value=symbolID

                },

                new EB.ExecuteSheetOperationRecordData()

                {

                     Qualifier=(int)EB.ExecuteSheetOperationModes.ArgExecSheetFctSel,

                     Value=0

                }

   };

            drawingSheet.ExecuteSheetOperation(ref data);

        }