Importing play 2.3 project with IntelliJ 14

I created a Play 2.3 application with "activator" by using the "Play Start App" template and imported it in Intellij14. (Start Intellij -> Import project -> selected "build.

Starting the application from the command line and accessing it with the webbrowser works:

> activator: compile

> activator: ~run

Unfortunately, Intellij isn't able to find the "routes" symbol (Message: "Cannot resolve symbol 'routes'"). Resolving and compiling the view templates works however.

Does anyone know how to solve that?