Certain allotments may be restricted to certain access groups only. Instead of having to select or deselect each access group separately in the allotment contract, you can combine different access groups by assigning them the same allotment visibility index. Users will only be able to work with those alltoments that are permitted to their access group.
For example, an external reservation office may be able to access their allotments at the hotel, but not any other allotment that the hotel has contracted directly.