When performing a stock adjustment, the unit cost used by most actions reflects the Cinema Manager system setting StockReceiptsDefaultCost.
For the Create waste and Reverse waste actions, you must use standard costs.
The action Incoming transfer defaults to use the Standard cost, but allows you to specify the actual cost. Receiving incoming stock at a different cost affects the Weighted average cost and Last cost of the item. Backdating incoming transfers of an item with a different cost historically affects the current Weighted average cost of that item, and will also recalculate the average cost for all transactions of that item from the backdated transaction to the current business day.