All group bookings must have at least a soft or a hard allocation for at least one room type for each day of the group. Soft Allocations only guarantee rate for the type. This is useful if providing a group booking discount but not guarantying availability. Hard Allocations guarantee both rate and availability for the group booking. Any hard allocations are immediately deducted from the type availability and reserved for the group. Hard Allocations may only allocate up to the maximum # of rooms that belong to the type. Hard Allocations cannot over allocate beyond the maximum count for the type and cannot be used to push a property into an overbooking scenario. Because a group booking isn't allowed to overbook a property you can find a scenario where the type has been overbooked by staff and when editing the current availability on the type shows –X and you get an error "No. of rooms allocated exceeds available no. of rooms for the selected room type(s) for at least one of the days" To better understand how this can happen and how to resolve it please see the following Knowledge Base article. http://helpdesk.bookingcenter.com/index.php?t=kbase&act=kans&id=376
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