Once a spare part has been identified, the employee can view the current stock levels and the exact storage location of the parts on a mobile PC terminal. This makes it easier to find an existing stock. If a part is not in stock, a purchase requisition can be triggered. If spare parts are not to be issued by the maintenance staff themselves, but rather via a central warehouse, this process can also be mapped completely digitally. When a reservation is created on the tablet PC, the demand is immediately displayed in the warehouse on a demand monitor. The warehouse clerk can begin with the removal and disposition even before the maintenance staff arrives at the warehouse. This leads to a higher process efficiency and reduces repair time and downtime, especially in case of machine malfunctions.