5.12 Good to know — inventory

A balance can never be edited — and that includes by support. Every correction you will ever need has a document: an adjustment, a count, a reversal. If a figure looks wrong, the path is always find the movement (the ledger's source links exist for exactly this), never fix the number.
Valuation is the moving average, never the latest price. A receipt at a surprising price moves the average a little, not the whole shelf to the new figure — which is why the valuation and the books can agree, and why a "but we paid X last time" argument is answered by §5.5, not by revaluing.
The freeze protects counts, and only counts. If a receipt or issue is refused naming a stock count, the count is open on that product and warehouse: finish it, post it, or cancel it — the refusal lifts with the count, and there is deliberately no override switch to reach for.
Lots are per product, not per company. Turning on lot-tracking for the feed does not complicate the nets and fuel: the flag lives on the product record, and products without it move exactly as they always did.
Quantities always name their unit. Every row in every enquiry and report carries its unit of measure. If you ever see a bare number, treat it as a defect and report it — "40" is not a quantity.