Maintenance activity type is a key for the type of maintenance activity provided, such as repairs, shutdowns, regular activities, inspections, and so on. It is used to classify data according to the type of maintenance activity in cost evaluations, for example, total costs or number of orders for each technical object1.

Maintenance activity type can be used in the maintenance order header and the maintenance order operation. In the maintenance order header, it is used to specify the overall type of maintenance activity for the order. In the maintenance order operation, it is used to specify the type of maintenance activity for each operation within the order. The maintenance activity type in the operation can be different from the one in the header2.

Maintenance activity type cannot be used in the notification activity or the work center. Notification activity is a key for the type of activity performed in response to a notification, such as inspection, repair, or preventive maintenance. It is not related to the maintenance activity type. Work center is a key for the location where an operation is performed, such as a workshop, a laboratory, or a machine. It is also not related to the maintenance activity type.

References: 1: maintenance activity type (PM) (SAP Library - Glossary) 2: maintenance activity type in SAP - Everything you need to know : notification activity (PM) (SAP Library - Glossary) : work center (SAP Library - Glossary)