Solution : https://service.sap.com/sap/support/notes/522711 (SAP Service marketplace login required)
Key words : 
application group ->additional components -> upgrade tools -> corrections, service releases featuring improved upgrade procedures, sapcar '-xvf <sar_archiv> -h' continue prepare, sap web application server release 6, 20 -> #os independentor directly underhttp, _app=00200682500000001943& _event=disphier&header=, file <putdir>/bin/toolfix_stamp, sapcar '-xvf <sar_archiv> -h', avoid subsequent authorization problems, <dir_put> directory   cd <dir_put>
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