On May 23, 2016, at 11:16 , Raimond Hettrich <[email protected]> wrote:
> 
> I have the following problem with the constellation 
> coreData-treeController-outlineView.

Well, you keep asking, and you keep getting no answer, because no one on this 
list knows the answer — the problem domain is too large even to guess where to 
look.

My intuition says the problem is unwanted duplication. Somewhere within the 
complex of components (Core Data, KVO, NS…Controller, table view plus whatever 
else) there is a pair of duplicate objects, which means your data model isn’t 
actually connected to the user interface presented to the user. This sometimes 
happens to developers who are new to Cocoa because it’s not always obvious 
whether objects are created programmatically (via code) or archivally (via IB 
design).

I think your next step is to try to make your problem smaller. (It might help 
to work in a copy of your project, if your debugging changes are destructive.) 
Try adding objects to your managed object context via code, and see whether 
those changes are saved.

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