Alternative to nested type of type Expression<Func<T>>

I have a function used when calling a service. Before it call the service, it will create a log entry:

protected TResult CallService<TService, TResult>(TService service,
    Expression<Func<TService, TResult>> functionSelector)
{
    Logger.LogServiceCall(service, functionSelector);
    return functionSelector.Compile()(service);
}

The Visual Studio 2010 Code Analyzer informs me that I shouldn't use Nested Type in the following message:

CA1006 : Microsoft.Design : Consider a design where 'ServiceManager.CallService<TService, Result>(TService, Expression<Func<TService, TResult>>)' doesn't nest generic type 'Expression<Func<TService, TResult>>'.

While I could simply create a suppression rule for this entry, is there is an alternative that exist that would prevent displaying such warning?