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Steps to reproduce: 1. create a sample java ant-based project in the IDE. 2. Create a sample maven project in the IDE. 3. Try to add the maven project as a Project (Add Project...). 4. Nothing happens. Add it as an external .jar (found in the target) it works. Bug because at least gray-out maven projects if it's known that one cannot add them. Otherwise wanted enhancement.
You cannot add it as a subproject. The Add Project dialog is supposed to somehow inform you that the selected project cannot be used for this purpose; apparently that is broken.
*** This bug has been marked as a duplicate of bug 149366 ***