Custom fields and multiple categories

Hello

I'm trying to set up custom fields to different categories of events. The configuration setting is set to yes so that custom fields are attached to categories instead of events.
There are different categories of events. The parent category is "Kurse", then there are different subcategories like "Nothilfe-Kurs", "Samariter-Kurs" etc. Then there is a special kind of an event. It is called "eNothelfer", it is a subcategory of "Nothilfe-Kurs" and therefore a subsub category of "Kurse". See the picture.


I then define the different events. Some of them are assigned to three categories. First to the parent "Kurse", then "Nothilfe-Kurs" and as the third one "eNothelfer". "eNothelfer" is a special kind of "nothilfe-Kurs". See picture


The category "eNothelfer" has custom fields, that all the others don't have. Because of that I assigned the custom field to the "eNothelfer" category. See picture.


This is the setup. I now try to figure out where the new custom field "MeinTest" is actually shown. Well with this setup it is shown nowhere. I did some tests and I found out that I have to remove all the categories from the event except the "eNothelfer" in all other cases the field is not shown. This is no option since then the menu items don't really work anymore for the different types of the events. Menu item for "Nothilfe-Kurs and its subcategory "eNothelfer", one for "Samariter-Kurs" etc.

Am I doing something wrong here or am I not getting the idea of how this is supposed to work? Could you please advice?

Thanks

Roger