Item History
Once an item added into the stock, its entire movement and footprint can be monitored by checking its unique number(IMEI or Serial Number).
a. When an item bought, by who, from who, at what price
b. when an item was sold, by who, to who(if customer details were added at POS), at what price
c. If an item was refunded, by who, when, what reason, what happens next
d. If an item moved from one store to another or from one category to another or from one item id to another id
e. If an item resold or added back into stock after RMA Almost every movement of any single item can be tracked.
This gives you a great advantage to skim through the histroy of any item incase if any investigation arise.