Apart from the trade mission, I´ve got some other questions now.
The event "Benign Neglect" gives me either 10% plus in taxes in one province (and something else) or 500 ducats right away. As 500 ducats is my income of 4 years, I wonder whether this event is correct as it is.
What triggers the event "Capital Unrest"? It fires always at the end of the last one and has no actual effect, at least for me.
Although I´m not the emperor of the HRE I´m getting a core province, if I´m conquering imperial provinces from non-members. Should it be like this?
Somehow I didn´t get any missions which would give me a CB in the last time (are there still the country specific missions?) and now I even got the mission to make myself the lesser partner in a personal union. It would be nice if there could be more CB-giving missions.

And a last one: I´ve got 100 prestige, 0 infamy, it says "Gorz gets inherited by Austria on death of monarch" and I´m in no war so far, in spite of that I don´t inherit Gorz when the king dies. Why is that so?