Use the function both directly and as a lambda expression

Is there a better way to implement this? Should I worry about the efficiency of the compilation method here?

     Public Overrides Function GetValidSerialNumbers() As System.Collections.Generic.IEnumerable(Of SerialNumber)
        Return Queryable.Where(allSerials, SerialNumberValidFunc)
     End Function

     Public Overrides Function IsSerialNumberValid(serialNumber As SerialNumber) As Boolean
        Return (SerialNumberValidFunc.Compile().Invoke(serialNumber))
     End Function

     Private ReadOnly Property SerialNumberValidFunc As Expressions.Expression(Of Func(Of SerialNumber, Boolean))
        Get
           If ProductionReceiptLine.MOOutput Is Nothing Then
              Return Function(sn As SerialNumber) sn.ItemInventory Is Nothing AndAlso _
                    (sn.Status = SerialNumberStatusValues.Planned AndAlso sn.MO Is ProductionReceiptLine.ProductionReceipt.MO _
                     OrElse sn.Status = SerialNumberStatusValues.Assigned)
           Else
              Return Function(sn As SerialNumber) sn.ItemInventory Is Nothing AndAlso _
                    (sn.Status = SerialNumberStatusValues.Planned AndAlso sn.MO Is Nothing OrElse sn.Status = SerialNumberStatusValues.Assigned)
           End If
        End Get
     End Property

The reason I want the lambda expression is because I want this function to be able to go through LINQ-to-SQL completely in order to convert it to SQL. The reason I need the direct version is because I have another code that I want to check for individual serial numbers before submitting the changes. And I'm afraid that GetValidSerialNumbers.Contains(serialNumber)will fulfill a more complex than the required request.