It is important to remember that EUAs (Exclusive Use Areas) will always remain part of the Common Property.
The fact that only one section has access or use to a specific area does not automatically make it an EUA.
To create an Exclusive use Area the sectional plans needs to be amended, approved and registered or it should be added to the rules (Section 10) of the STSMA
Exclusive use areas are not indicated on the owners title deed but on the separate notion deed of lesion that is also registered at the deeds office.