Solution : https://service.sap.com/sap/support/notes/860992 (SAP Service marketplace login required)
Key words : 
http-access logs \usr\sap\<sapsid>\<instance_name>\j2ee\cluster\server0\log\system\httpaccess\responses, \usr\sap\<sapsid>\<instance_name>\j2ee\cluster\server0\log\system\httpaccess\responses, topics                                        date changed======                                        ============1 general information                          25/apr/082 pre-installation                              18/, application group -> sap technology components -> sapinst -> sapinst 7, general information +===================================================================+----------------------<d035521 mar/26/08 >--------------------------abap+java, existing primary application server instance, /093 installation                                  10/sept/094 post-installation                            16/apr/08+===================================================================+ 1, creating j2ee engine users, http-access logs, basic sap system parameters
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