VB.net SAP 'PeakConnectionsLimit' is not a member .....

Hi
I get the following error on the line marked ERROR HERE in the code further down


Error      3      'PeakConnectionsLimit' is not a member of 'SAP.Middleware.Connector.RfcConfigParameters'.      C:\Users\murbro\Documents\Visual Studio 2010\Projects\SAP_Connection_1\SAP_Connection_1\ECCDestinationConfig.vb      26      27      SAP_Connection_1


Imports SAP.Middleware.Connector

Public Class ECCDestinationConfig

    Implements IDestinationConfiguration

    Public Event ConfigurationChanged(ByVal destinationName As String, ByVal args As RfcConfigurationEventArgs) Implements IDestinationConfiguration.ConfigurationChanged

    Public Function GetParameters(ByVal destinationName As String) As RfcConfigParameters Implements IDestinationConfiguration.GetParameters

        Dim parms As New RfcConfigParameters

        Select Case destinationName

            Case "DEV"

                parms.Add(RfcConfigParameters.AppServerHost, "10.0.0.47")
                parms.Add(RfcConfigParameters.SystemNumber, "00")
                parms.Add(RfcConfigParameters.SystemID, "ED1")
                parms.Add(RfcConfigParameters.User, "009383")
                parms.Add(RfcConfigParameters.Password, "....")
                parms.Add(RfcConfigParameters.Client, "100")
                parms.Add(RfcConfigParameters.Language, "EN")
                parms.Add(RfcConfigParameters.PoolSize, "5")
                parms.Add(RfcConfigParameters.PeakConnectionsLimit, "10") 'ERROR HERE
                parms.Add(RfcConfigParameters.IdleTimeout, "600")

            Case Else

        End Select

        Return parms

    End Function

    Public Function ChangeEventsSupported() As Boolean Implements IDestinationConfiguration.ChangeEventsSupported
        Return False
    End Function

End Class