Metal sold by weight, at a moving rate
Brass and other metals price against a market that changes, and a selling rate set last month against a cost that has risen since is a quiet loss on your highest-turnover line. Updating the item rate when your purchase rate moves applies it to every bill afterwards, and rates agreed with regular units are held against them so a staff member does not have to know or ask.
Manufacturing units as customers
An export-linked unit buys to a production schedule and settles on its own cycle, often against a shipment being paid for. That pushes the credit period out and makes ageing the figure that matters. A limit set per unit before material leaves keeps your exposure inside what you can carry, particularly when several units are running the same cycle at once.
Specifications on the bill
Units ordering to a specification check the invoice against the order, so grade, size and finish belong on the item rather than in a note. That also settles the conversation months later when a batch is questioned, and it prevents billing a premium grade at the rate of something similar looking.
The building trade alongside
The city keeps building, so the same shop typically carries cement, TMT, sand and fittings for house builders and small contractors. A mixed invoice with three GST slabs is the ordinary case, and holding the rate on the item makes it correct without a decision at the counter.
Setup and offline billing
Setup is a thirty-minute call in Hindi. Power cuts are routine enough that most shops here run the Android app and bill offline, syncing when coverage returns, with a Bluetooth thermal printer meaning no computer is needed at the counter.