useLegacyV2RuntimeActivationPolicy is required for web applications in web.config ?

Hello, 

I'm using Crystal Reports for Visual Studio 2010 SP1,  version 13.0.3.612

I have created an ASP.NET web application compiled as x86 and .NET Framework 4.0 as target

I am not sure if I need or not in the web application web.config  the following setting  ?

<startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0"/>
</startup>