Room costs per room must be maintainable. There must be the possibility of maintaining the room costs per day as a flat rate (regardless of the duration of the meeting). A cost overview for the customer is essential. Today it can only be maintained in a roundabout way (minimum costs on an hourly basis). The daily costs must then be taken per day, even if a room booking extends over several days. Currently, it is not clearly visible to the customer that the costs for the room booking are a flat rate, which is not justifiable.