A method of fulfilling orders in a warehouse with an order fulfillment area comprising the steps—storing slow-moving items in a first storage comprising mobile shelf units, automated transportation of slow-moving items needed for order fulfillment on the mobile shelf units from the first storage to an unloading station, where at least one of the slow-moving items needed for a certain order is manually transferred into a receptacle, routing of the receptacles directly to picking stations if needed right away, otherwise routing of the receptacles to a second storage and storing the receptacles therein. When all of the items to complete an order are available and/or are stored in the second storage, retrieving the receptacles containing items for fulfillment of the certain order and transporting to one of the picking stations for specific item retrieval for fulfilling the certain order.