F1 Fantasy Game

 I tried different setups for my team and tried to replaced Perez for max and then there was not enough money anyway. Sident se anywhere in the rules that you would loose money on swapping drivers? Anyway I bought Perez again, and now he is worth apx 500.000 less. I think that this is wrong cause there was not made a change in the team. Is there a way to do a roll back to previous them?