Hello cdutz
With every release (1.12, 1.14, 1.20, ...) the system apps have to fit to the functional apps. That's (unfortunately) the current state. And in this problem you are running in.
You are completely right, that an user expects a better messages whats going on. That's the reason why with the next versions the functional apps will get an system app check. Means if you try to install a functional app what does not fit to the system a message will give you this information and this before you install it. But as I said at this issue we are working currently.
Regards
Jochen
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