Solution : https://service.sap.com/sap/support/notes/921593 (SAP Service marketplace login required)
Key words : 
step key nw_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, <sapmnt>/<sapsid>/sys/exe<sapmnt>/<sapsid>/sys/profile<sapmnt>/<sapsid>/sys/global------------------<c5050847, choose <sap system> -> additional software life-cycle tasks -> application server -> <database> -> dialog instance, </usr/sap/<sid>/<instance_name>/j2ee/cluster/server0/log/system/httpaccess/responses, /usr/sap/<sid>/ <instance_name>/j2ee/cluster/server0/log/system/ httpaccess/responses, /nw70 -> supplementary information -> sap netweaver library [en] [de] contents sections, <sapmnt>/<sapsid>/exe<sapmnt>/<sapsid>/profile<sapmnt>/<sapsid>/globalnot, -> sap netweaver -> sap netweaver 2004s -> english -> sap netweaver library -> sap netweaver, /nw70 --> sap library --> sap netweaver library --> technology consultant', 26 dia  000 000 sapsys                f6  1 temse input/output tounopened file18
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