Allocation of Different Device Category via PM 
Prerequisites
The device you wish to modify is not maintained in the Inventory Management (MM-IM) application component.
Procedure
Choose
Choose and enter the serial number. Chose Continue .
Choose Serial data and then
The Change material serial number dialog box appears.
Enter the new material. Chose Continue .
( )
You may be notified of the system status of the device (piece of equipment).
Save your data.
Result
A different device category (material) has been allocated to the device.