Oh sorry,
So within EASA time, and before as JAR..
The first multiengine / instrument rate airplane would a BE90-King Air.
But now with EASA time, the BE90 is prohibeted to be first aircraft for multiengine / IR-training.
BE90 needs a typerate training in Finland, it has 2 turboprops, but MTOW is under 5700kg. As I know the first multiengine / ME-IR training should be done with piston aircraft like DA42 or so.
So first I should (with EASA) get a class-rate for multiengine with a pistonengine aircraft. And then the typerate for BE90.
With JAR it could be done straight with BE90.