Solution : https://service.sap.com/sap/support/notes/498140 (SAP Service marketplace login required)
Key words : 
install report zioclas0, order summarization reason, terms summarization, report rioclas0, report terminates, maintenance order, service order, maintenance orders, service orders, errors occur
Related Notes : 
       
| 421975 | CL30N: Search w/ reference characteristics finds no objects | 
| 47030 | PM order: Classification in background (RIOCLAS0) |