I am fairly new to access but I am playing around with the Product Inventory Template offered by Microsoft for a small business operation. I want to add a new field to the PurchaseOrders table that will calculate taxes automatically for me because right now taxes must be added manually to the table rather than through a form. Since the table already has a Taxes field, I just need to add a Tax Rate field so that I can right a quick script that will calculate the taxes for me. When I try to insert a new field nothing happens, it just disappears immediately. I assume that there is some sort of lock on that table, but I cannot find a lock of any kind. Does it have to do with this table being attached to a form?