Grails inplace plugin that references another plugin

Is there a way to configure IntelliJ to recognize references between inplace plugins? For example:

     Main App references MyPlugin1 which references MyPlugin2

When I use "grails run-app" everything works fine, however, IntelliJ cannot see the link between the inplace plugins and highlights the reference to MyPlugin2 from MyPlugin1 as an error.

Am I doing this right? Is there another way to link inplace plugins?

I've created a sample application on GitHub:

https://github.com/mikedehaan/inplaceDepend

This is using Grails 2.4.4 and Intellij14 with JDK 1.8.