Entry filtering and inventory purging
You will now have the ability to set a list of rules for which to list and keep books in your inventory. You may want to set rule for minimum price or to look at your current inventory (aging and/or multiples of the same isbn). After you set these rule(s), the cataloguing system can reject books that don't fit your data entry criteria. Also, you can use these rules to do a regular purging of your inventory.