Thank you all for your input. The mist is beginning to clear.
In the beginning I felt quite sheepish thinking I was missing something. I'm just glad I'm not the only one ...
By the way, the aircraft in question is a Dornier 228, MTOM 6400kgs.
From the information I got so far this makes it a single pilot, complex, non-high performance aircraft; and CRI / CRE will still be sufficient.
Cheers,
FR