Non-persistent self-reference - How to find the childs for a parent?

Hi, Here is my problem – hope it is just ignorance, that is solvable … at least temporarily. PartCategoryNP has a parent-child relation with itself. Is it possible to find the childs via this relationship? As these are non-persistent entities, I'm not able to use a [reversed]. To solve it, I associated every PartCategoryNP with Binder via the _All association and filter those on the parent object. Workable but it does not  look like the best solution. Thanks for reading! Toon
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