What about booked seat types in case of combined flights (with stop-over)?
For flights with a stop-over that combine 2 destinations it is possible you can only occupy your booked seat type from the second destination.
An example:
If you have booked a flight from Brussels to Alicante with a stop-over at Almeria, your booked seat type will be respected from Brussels to Alicante.
If you have booked a flight from Almeria to Brussels with a stop-over at Alicante, you may occupy one of the free seats between Almeria and Alicante and occupy the booked seat type from Alicante to Brussels.