You can allow the notification type of maintenance notifications to be changed if the original notification type and the target notification type have the same notification category. You allow this in Customizing for Plant Maintenance and Customer Service under Maintenance and Service Processing Maintenance and Service Notifications Notification Creation Notification Types Define Allowed Changes of Notification Type. In the SAP standard configuration, you can allow the change between the following notification types of notification category PM Notification: In addition, you can only change the notification type of maintenance notifications if the notification has not yet been completed. When the notification type is changed, the system does not assign a new notification number and all data of the original notification type is retained (such as reference objects). This also applies even if specific data is irrelevant for the target notification type. To override this behavior, implement the Business Add-In (BAdI) Checks for Extended Change of Notification Type (BADI_IQS0_NOTIF_TYPE_CHANGE).