Solution : https://service.sap.com/sap/support/notes/967123 (SAP Service marketplace login required)
Key words : 
step keynw_uninstall ind ind ind ind 0 0 nw_system_uninstall ind ind ind ind 30 nw_system_uninstall_users ind ind ind ind 5 0 removesystemusers wasexecuted, -> supplementary information [open] -> sap netweaver library [en] [de] -> sap library -> sap netweaver library -> sap netweaver, -> system administration [open] [close] -> security guide -> sap netweaver security guide -> security aspects, key capability -> software life-cycle management -> software maintenance -> java support package manager, sap netweaver 2004s sps 12  java-based software components dvd10/mar/09    4      delete usagetype, script nw_abap_prepare ind ind ind ind, sql server 967742    sap nw 2004s sr2 & sap bs 2005 sr2 inst, key capability -> software life cycle management -> system landscape directory, /usr/sap/qo1/jc00/j2ee/cluster/server0/log/defaulttrace, sap netweaver 2004s sps 12 java based software components dvd
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