[whpalmer4]

I thought you were just using OmniFocus in German to practice your German language skills, but I guess I was wrong :-)

The idea behind the behavior is that you should be able to work your way through an entire project while in Context view, including marking the project complete once all of the actions are done. The project "action" that you are seeing in the No Contexts bin, when marked complete, completes the project.

The same behavior applies to action groups (nested actions). The parent action becomes available when all of the children are marked complete.

Make a simple example project with a few actions. Focus on that project in project mode, then switch to context mode (cmd-2) and watch what happens as you check off the actions.