Solution : https://service.sap.com/sap/support/notes/74770 (SAP Service marketplace login required)
Key words : 
commands       tp unlocksys <sid>      tp unlock_eu <sid>, tp locksys <sid>tp lock_eu <sid>blocks, directory/usr/sap/trans/bin, additional key words rixpra01, prerequisites program error, correct equipment values, phase job_ldtch_<rel>, phase main_<rel>, phase xpras_<rel>, sap hotline
Related Notes : 
       
| 64570 | Additional Info: Upgrading to 3.1G | 
| 48632 | Additional Info: Upgrading to 3.0F | 
| 43288 | Additional Info: Upgrading to 3.0E | 
| 37387 | Additional Info: Upgrading to 3.0D | 
| 33004 | Additional Info: Upgrading to 3.0C |