When an order is created, reservations are created for the components kept in stock. These reservations obtain a movement type for withdrawal. You control the material withdrawal using the movement type.
In the standard system, movement types are preset which you must not change.
For the components, Plant Maintenance and Customer Service, the entry with the key 'IWO1' is relevant. In addition, you only need the two entries for the goods issue (GI) of materials for maintenance orders and the accompanying reverse operation (GI cancellation).
Do not under any circumstances delete other entries, since these are required by other R/3 applications, for example, the PP system.