The Belgian B league is fucking weird. 10 teams and the season split into two halfs with the winner of each half playing each other in a play off to decide promotion. Then the rest of the midtable teams in the aggregate table go into Europa League play off groups from the top-flight, with the bottom four into a relegation play-off.
At least that's how it was when I last played FM with White Star Brussels (basket case of a club)