Does it fit my car?
The question at every counter in this trade, and the one a normal billing app has no field for. Each product carries which vehicles it fits, in your own shorthand — Swift/Dzire 2018+ — and it is searchable, so a wiper for a Creta is never sold for a Swift.
Warranty claims two years later
A battery comes back at month 30 of a 36-month warranty. The serial number and the warranty months are on the original bill, so the claim is settled by looking it up rather than by arguing about it.
The maker's part number, not just yours
Customers and distributors quote the manufacturer's number. It is recorded alongside your own item code, so stock can be found by either.
Sizes and colours that are real stock
A tyre in 195/65 R15 is different stock from 185/65 R15, and a seat cover in beige is not one in black. Each is counted, priced and barcoded on its own without becoming a separate product to maintain.