Solution : https://service.sap.com/sap/support/notes/774567 (SAP Service marketplace login required)
Key words : 
/400 db4 db2/400 r3check qprint stdout ovrprtf ovrdbf reason, '/usr/sap/tmp/mysrc', prerequisites r3check outputs occur, '/usr/sap/tmp/r3checkout, physical file qgpl/r3checkout, user <sid>ofr, r3check output difficult, r3check output directly, ovrdbf    file, ovrprtf file
Related Notes : 
       
| 773920 | Truncated output lines during R3check | 
| 89384 | Checking cluster tables with R3check |