Add the option to allocate/assign a range of unique numbers/IDs to an offline area, while creating it in the office.
If there are multiple offline areas, each one will have a different and unique set of numbers or (alphanumeric manmade) IDs (i.e., not Global ID).
Any numbers/IDs range that was assigned to one offline area, cannot be used in a different offline area.
Each offline area will also be assigned to a specific user. No two users can download the same offline area. Each user will be able to add new features with unique IDs within the range assigned to their offline area.
Users will be able to create offline areas on their devices (the same way as they do now), but without the option to add new features.