Serialized products are tracked by individual serial number instead of by simple quantity. Use this for items that need warranty, theft, or installation tracking (head units, amplifiers, alarms, GPS units).
To enable: Open the product and click Edit; the Serialized toggle is on the edit form (not the show page). Save. Existing stock will need to have serials assigned the next time they are received.
To receive serials: When you receive a purchase order for a serialized product, you are prompted to scan or type the serial number for each unit. Serials enter inventory as "in stock".
To sell a serialized product: When you add a serialized product to an invoice, the system shows the available serials and asks you to pick which one. The chosen serial moves to "sold" and is linked to that invoice and customer.
To look up a serial number: Go to Inventory > Serial Lookup. Enter a serial to see the product, current status (in_stock, reserved, sold, defective, returned_to_vendor, or missing), purchase order it came in on, and the invoice and customer it sold to.
Stock adjustments for serialized products must be done by editing individual serials, not by changing a bulk quantity.