Each product contains stock level information that is automatically updated when you take orders, receive inventory from vendors and when customers return merchandise. The Stock Levels screen includes: Non-Inventory Item - Checking this box prevents tracking of quantities. This is useful for items you never want to have backordered, drop shipped items etc.   Drop Ship Item - Check this box for items you have shipped by another vendor. This field is used by some reports (e.g., to create purchase orders to vendors) and in conjunction with the Non-Inventory Item field to prevent backorders.   In Stock - the number of items currently in inventory.   Committed - For each item entered on an order the In Stock field is decreased by 1 and the Committed field is increased by 1. Items remain committed until the order is closed. You can simply ignore Committed quantities, or use them to manage daily orders (e.g., transfer items from one order to another to make it complete).   On Backorder - Tracks the number of items in backorder status on orders. When the product is received in inventory the number is decreased here and added to In Stock. You can use the Process Open Orders action to fill backorders.   Level Settings - Tell Mailware Home Office to remind you (in a report) to order more inventory when In Stock levels reach your Reorder At threshold.   On Order - The quantities for this item on Order and Backorder from your vendor. The quantities and expected dates are displayed during order entry so you can inform your customers when to expect shipment.   Average Cost - Automatically maintains an average cost per item based on prices you paid vendors. This amount is used for inventory valuation and can be edited.