Solution : https://service.sap.com/sap/support/notes/1601968 (SAP Service marketplace login required)
Key words : 
trace level reset reason, symptom trace level, terms trace level, setting trace level, sp patch level, trace level, patch level, prerequisites reason, correct values, configuration file
Related Notes : 
       
| 1497826 | NetWeaver Mobile 7.10 Composite Note for SP11 |