Every stock movement that changes value writes a valuation layer — a receipt at its purchase cost (plus any landed costs like freight or duty), a delivery at cost out, a revaluation as an adjustment. This page is that ledger, product by product.
A receipt comes in at the order’s net price per piece (after discount, in your currency at the order’s rate; a carton’s price is shared over its pieces). Freight and duty on a bill join the goods they were paid for. What goes out — a delivery, the till, a spare-part withdrawal, a manufacturing order, a count, scrap — leaves by the product’s costing method, and that exact amount is what the books post (your COGS on a sale):
Average — on-hand value ÷ on-hand quantity. 100 at 10 plus 100 at 12 → average 11; sell 50 → COGS 550, value left 1,650.
FIFO — the oldest stock goes first. The same two receipts, sell 50 → COGS 500 (from the units at 10), value left 1,700.
Standard — everything moves at the standard you set; what you actually pay differs and that difference goes to price variance. Change the standard with Revalue on the product.
Qty on hand and value here are what the layers with units left hold. The Health check tab compares that with the books and the shelves.