In ADvendio.com, the availability status of a campaign item is indicated by a colored flag. It is calculated by a formula that subtracts the planned availability from the booked quantity.
The Flag Colours
Each campaign item is assigned a flag under Availability.
ADvendio__BookingQuantity__c - ADvendio__Availability__c <= 0
ADvendio__BookingQuantity__c - ADvendio__Availability__c <= 0