Multiple targets with different default images

I am trying to build lite and pro versions of the same app using multiple tagrets in the same iOS project. I have created two sets of default images - Default.png, Default@2x.png and Default-568h@2x.png and checked them to be used in one target each. The default images for non-retina and retina-3.5 inch work as required but the one for retina-4 inch does not show up in the build. Hence the build runs in the compatibility mode as a 3.5 inch app. Is this a known issue or is there a way to make it work? Any help is greatly appreciated.

Thanks