S60 55reg Fuse box diagram in the boot

[MRkSTL]

Hi,

I purchased a reversing camera kit and initially bridged the camera with the reverse light ,however that didn't work due to not sufficient power. So I decided to use a fuse adapter and plugged it into fuse box in the boot.

I have used fuse number 14 (just randomly), but it is a live fuse, so the camera is switched on even without the ignition turned on.
I tried to check in the manual what is it responsible for, and according to manual, there should be no fuse at all. I went on google to get more info, but it actually also seems that there should be no fuse in this socket. It is bit awkward, but I wonder if you also have a fuse there and perhaps know what is it for?

In the end I used fuse no 20 as it powers on only with the key in, so it won't drain the battery. I checked the manual what is the fuse no 20 for and it says it's the towing wiring (Even though the car doesn't have a towing bar?).

Thanks for any help