AccessViolationException FromWarehouseCode

Hi people.

I have a problem about an AccessViolationException with StockTransfer.FromWarehouseCode property when I try to set a value.

The real problem is that the exception occur if the addon run under UI. If it runs as external addon, just DI, it works fine.

The code is this

   Public Sub trasferimento()

      Dim _b1Maga As SAPbobsCOM.StockTransfer = _cmp.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oStockTransfer)

      With _b1Maga

         .DocDate = DocDate

         .TaxDate = DocDate

         .Comments = Comments1 + vbCrLf + Comments2

      End With

      With _b1Maga.Lines

         .ItemCode = ItemCode

         .Quantity = Quantity

         .FromWarehouseCode = FromWH     <<< THIS FAILS UNDER UI

         .WarehouseCode = WHCode

      End With

      With _b1Maga.Lines.BinAllocations

         .BinAbsEntry = getIdUbicazione(FromBinAE)

         .Quantity = _b1Maga.Lines.Quantity

         .BinActionType = SAPbobsCOM.BinActionTypeEnum.batFromWarehouse

         .BinAbsEntry = getIdUbicazione(BinAbsEntry)

         .BinActionType = SAPbobsCOM.BinActionTypeEnum.batToWarehouse

      End With

      Dim lErr As Long = 0

      Dim sErr As String = ""

      Dim ret As Long = _b1Maga.Add()

      If ret <> 0 Then

         _cmp.GetLastError(lErr, sErr)

         If lErr <> 0 Then

            Throw New WarehouseMovementException(lErr & " " & sErr)

         End If

      End If

   End Sub

The properties before and after are setted correctly.

The addon runs under SAP Business One 9.1 PL 09.

In my opinion is a SDK bug and so I searched about it under SAP notes but I'm not a lucky man.

Someone can confirm if it is a SDK bug? and, especially, is there a workaround?

Thanks a lot

Nicola