Removing batch allocation via SDK possible?

Hi all.

since 9.1 PL11 it is no more possible to remove batch allocations via sdk / xml. normally we do that via:

   If order.GetByKey(docEntry) Then
         order.Lines.BatchNumbers.
         ' Auftrag als XML holen
         sboCompany.XmlExportType = SAPbobsCOM.BoXmlExportTypes.xet_ExportImportMode
         Dim xml = order.GetAsXML()
         Dim xDoc = XDocument.Parse(xml)


         ' Chargenreservierungen holen und entfernen
         Dim batchRows = (From x In xDoc.<BOM>.<BO>.<BatchNumbers>.<row> Select x).ToArray()
         For Each batchRow In batchRows
            batchRow.Remove()
         Next


         ' XML ohne Chargenreservierungen speichern
         xDoc.Save("order.xml")


         If order.UpdateFromXML("order.xml") <> 0 Then
            Console.WriteLine(sboCompany.GetLastErrorDescription())
         End If
      End If

See note 2286694.

Does anyone knows a different mathod to remove batch allocations on a document (SO e.g.)? We tried to set the order.lines.batchnumbers empty and the quantity to zero. does not work.

Thanks in Advance.

Andreas