Solution : https://service.sap.com/sap/support/notes/1030162 (SAP Service marketplace login required)
Key words : 
object list entries active, order types -> define notification, service orders -> function, pm/cs order, customer service -> maintenance, service processing -> maintenance, object list, order integrationand, order type, technical object
Related Notes : 
       
| 1093881 | PM/CS order: Object list entries missing | 
| 1040660 | Extension to note 1030162 |