Building Use Ordinance § 14 Distinction between Main and Secondary Installations

Hello everyone,
we are building in a residential area with a confirmed development plan. The justification for the development plan states the following: "The floor area ratio of the general residential area is set at 0.4. This complies with the maximum limit of § 17 of the Land Use Ordinance. The permissible floor area refers to the main buildings, as well as garages and parking spaces. The exceedance possible according to § 14 of the Land Use Ordinance by outbuildings within the meaning of § 14 of the Land Use Ordinance of 50% is not excluded. This means that up to 60% of the plot areas can be built over and paved."
For the building application, besides the main building, we have also been approved a garage and the parking area in front of the garage within the framework of the floor area ratio 0.4. These two areas are thus "main facilities" according to §14 Land Use Ordinance.
Now I am concerned with the further design of areas and their admissibility through the distinction between "main areas" and "outdoor areas." We want to have an additional car parking space (temporarily only for visitors) and a storage space for our motorhome. With both of these areas, we would exceed the floor area ratio of 0.4. Are there possible justifications for these areas as "outbuildings"?
What advice and experiences do you have for me? Many thanks in advance! Please no advice like "Find another parking space for your motorhome" or similar...

Hello experts, please send me your suggestions... Hello home builders, how have you solved such or similar constellations with the exceedance of the floor area ratio through so-called main facilities and ancillary facilities? Let's be creative... Thank you!

Hello experts, please send me your tips...

Experts in the plural, you have missed some developments here. We still have one expert for floors - not for floor areas; the expert for surveying and state building regulations was driven away :-(

Parking spaces are not ancillary facilities but are assigned to the vehicle fleet, i.e., the floor area ratio l. Ancillary facilities are more like sheds, not even garden houses. That’s unfortunate for you. However, in my opinion, the sentence

Damit können bis zu 60% der Grundstücksflächen überbaut und befestigt werden."

is confusing because a paving does not necessarily have to be covered for me. Either ask by phone and, if approved, pave, or quietly pave with grass pavers (and hope that no one notices). If all this is still in planning, simply include it in the building application and that’s it. But then the architect would be the one to ask anyway.