What this page is for
This page shows a single unit: its item, store and batch, when it was received, and where it has been sold, the order, the receipt, the sale date and the customer. The warranty line says whether the unit is still covered and until when; the date is fixed when the unit is sold, so changing an item's warranty later does not change a warranty already given.
History
The history lists every movement of the unit in order: received, transferred, sold, returned, counted or written off, with the document that moved it and the store it was at. Nothing in the history can be changed.