1. Association can not force you to remove your car from a parking slot, bought by you with proper legal title. Please ensure that it is not just added to your purchase deed, but a real parking lot.
2. If it is common area all owners being co-owners, they can dictate terms.
3. Even if it is your area the reason of opening sump is (if) necessity, ask association for exchanging another area within the apartment if possible.
Since you are only talking about oral requests/.... by association, you may oblige or not.
No litigation need arises,
You could ask for a declaration suit with a lawyer to ensure you are the owner.