Because a single total hides where things are. The system says forty in stock, thirty-eight are three hundred miles away, and the order is promised on a number that was never actionable.
A warehouse is a stock location with its own quantities and valuation — a building, a van, a bonded area, or a customer's site for goods on approval.
Every movement names a location. Receipts, issues, transfers and adjustments all carry one, so availability is per site and valuation follows the goods rather than the company.
A customer wants twelve units tomorrow. Eight are local and four are at the second site, so the order shows the split and a transfer is raised with a date on it rather than a promise made blindly.
It will not tell you where in the building something is. Bin-level location is a warehouse system's job; Books tracks the site, the quantity and the value.
Sales orders reserve against a location, challans issue from one, purchase receipts land in one, and the balance sheet stock figure is the sum of them.
Valuation method is set per item; the location holds the quantity and its share of the value.
Yes, as a separate state until it is received.
Yes, for goods on approval or consignment.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.