Apart from allotment with a pre-determined set number of rooms, SIHOT also manages open allotments, which do not contain any particular numbers, but enable the allotment holder to reserve as many rooms as there are available at the hotel in general.
The number of rooms in an open allotment is 0 and the flag open allotment is set to yes.
Figure 3: Definition of an open allotment
As the tooltip shows, the rooms available for reservations from this allotment equal the number of rooms vacant on this day plus the overbooking percentage (as specified in the category master file).
Figure 4: Allotment rack - open allotment