When using AureliusDatasets the code in procedure TVirtualDataLink.RecordChanged(Field: TField); is raising an error in  tmp:=DataSet.RecNo; in certain situations which make it impossible to use TeeGrid with Aurelius Datasets in such cases.
This problem could be solved by altering the source code as follows ...

procedure TVirtualDataLink.RecordChanged(Field: TField);
var tmp : Integer;
begin
  inherited;

  if not IChanging then
     if Field=nil then
     begin
       // Tell the Grid the new current row number
       try
          tmp:=DataSet.RecNo;

          if tmp=-1 then  // <-- append / insert new record
             tmp:=0
          else
             tmp:=tmp-1;


       except
          tmp:=tmp-1;
       end;
       IData.ChangeSelectedRow(tmp);
     end;
end;


I do not know if this is a bug in TeeGrid or in TAureliusDataset ...


I have the following callstack ...
:755fa832 KERNELBASE.RaiseException + 0x62
Data.DB.DatabaseError('Operation bei geschlossener Datenmenge nicht ausführbar',$3735160)
Data.DB.TDataSet.CheckActive
Aurelius.Bind.Dataset.TBaseAureliusDataset.GetRecNo
Tee.Grid.Data.DB.TVirtualDataLink.RecordChanged(nil)
Tee.Grid.Data.DB.TVirtualDataLink.ActiveChanged
Data.DB.TDataLink.SetActive(???)
Data.DB.TDataLink.UpdateState
Data.DB.TDataLink.DataEvent(???,???)
Data.DB.TDataSource.NotifyLinkTypes(deUpdateState,0,True)
Data.DB.TDataSource.NotifyDataLinks(deUpdateState,0)
Data.DB.TDataSource.SetState(???)
Data.DB.TDataSource.UpdateState
Data.DB.TDataSource.DataEvent(deUpdateState,0)
Data.DB.TDataSet.DataEvent(deUpdateState,0)
Aurelius.Bind.Dataset.TBaseAureliusDataset.DataEvent(deUpdateState,0)
Data.DB.TDataSet.SetState(???)
Data.DB.TDataSet.SetActive(???)
Data.DB.TDataSet.Close
views.main.TfrSQLStressTestClient.adsQueriesAfterScroll($3734860)
Data.DB.TDataSet.DoAfterScroll
Data.DB.TDataSet.MoveBy(???)
Data.Bind.DBScope.MakeValidRecNo$155$ActRec.$0$Body$156$ActRec.$0$1$Body((($401118, Pointer($122A2B0) as IValueData, 2, 2, 2, $2, TClass($2), 2, 2, 2, 2,80259692864963e-45, 9,88131291682493e-324, 1e-4932, 2, 0,0002, 2, 2, ($2, nil), $2)))
System.Bindings.EvalProtocol.TLocationWrapper.SetValue(???)
System.Bindings.Outputs.TBindingOutput.SetValue($8503E10,TBindingExpressionDefault.Evaluate$4$ActRec($B358910) as TBindOutValueFunc)
System.Bindings.Expression.TBindingExpression.SetOutputs(???)
System.Bindings.ExpressionDefaults.TBindingExpressionDefault.Evaluate
Data.Bind.Components.TCustomBindGridLink.EvaluatePosSource
Data.Bind.Components.TCustomBindGridLink.PosChanged
Data.Bind.ObserverLinks.TBindPositionLinkObserver.PosChanged
System.Classes.TLinkObservers.PositionLinkPosChanged(???)
FMX.TMSLiveGrid.TTMSFMXLiveGrid.NotifyObserver
FMX.TMSLiveGrid.TTMSFMXLiveGrid.SelectCell((1, 2),[],False)
FMX.TMSCustomGrid.TTMSFMXCustomGrid.MouseUp(mbLeft,[],106,65)
FMX.Forms.TCommonCustomForm.MouseUp(mbLeft,[],190,158,???)
FMX.Platform.Win.WndProc(1575602,514,0,10354878)
:7602d2b3 USER32.SetManipulationInputTarget + 0x53
:7600e88a ; C:\WINDOWS\SysWOW64\USER32.dll
:7600e1e4 ; C:\WINDOWS\SysWOW64\USER32.dll
:7600dfa0 USER32.DispatchMessageW + 0x10
FMX.Platform.Win.TPlatformWin.HandleMessage
:008feca0 TPlatformWin.HandleMessage + $34
FMX.Platform.Win.TPlatformWin.Run
FMX.Forms.TApplication.Run
TestFrameworkClient.TestFrameworkClient
:75c262c4 KERNEL32.BaseThreadInitThunk + 0x24
:76ee0fd9 ; 
:76ee0fa4 ;