Hi Alexander,
For the Problem issue, it's fine for me, but in my understanding if we are not allowed to create Problems, why it is selectable in the xFlow.
Regarding the Categories topic, if you see the following printscreen, we added the "Category" and the "Ticket Type" fields.
If we set the value of TicketType to 3 on ServiceDesk. On xFlow when we change the "Ticket Type" to incident the "Category" field still filters only for Requests categories.
Again, when setting the value to 2, then on xFlow if we change the ticket type to Request, only Categories for incidents are shown.
The idea is, when changing the ticket type on xFlow, then the categories visible for the user should be the ones related with that ticket type.