I disabled the view of all layers, but a certain object is still visible. Why? How can i hide this object or how can i assign it to a layer?
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This is because you aren't seeing all your objects in the outliner.
Your object is parented to another object. You'll noticed that when the object in question is selected, one of the inverted triangle icons next to the parent object is highlighted rather then another entry.
Click the + next to the parent object to expand the view and show that object's child objects: