Subcontracting should change the Status of Equipment

Hey,

How can I make it happen that a subcontractor changes the status of equipment.
I tried to work with transactions (ADSUBCON). Have created a maintenance order (IW31). In addition, a purchase requisition (ME52N) and an order (ME21N).

How can I change the status of the equipment?
Maybe someone has a to-do for me?
 

Thank you very much

Taha