Currently, guest beers only go into inventory when they are receipted. We want to be able to add them to deliveries dated after their planned arrival date. Perhaps it makes sense to have an “Inventory date” as well as “Requested delivery date” that could be used to specify the date from which the items should be considered in stock.
Same applies to other inventory items - the stock levels of inventory items added to planned packagings should be taken into account as soon as planned, rather than at the point of racking. A purchase order to replenish stock prior to racking should also be taken into account.