[Koha] Koha - Items Available

I have migrated all circulation history to old_issues and all checkouts to the issues table. I have also edited the item records to reflect the current checked out items. But yet it still shows all items as available. I have checked out a book in koha and used it as a guide to see what changed in the database and then made the appropriate changes on the appropriate items. I can't seem to find the data element that directly controls items available. Any help would be greatly appreciated. - Joe