Solution : https://service.sap.com/sap/support/notes/395233 (SAP Service marketplace login required)
Key words : 
change history date            topic           short description------------------------------------------------------------------------oct/25/01 qrfc        reference, general conditions 70228 overview note 181255 release strategy note 214503 problems, car '-xvf /qopt/<volid>/data/<archiv>, car -xvf /<cd_dir>/data/<archiv>, spam function 'ignore generation error', choose 'installation package -> load packages, pi-a-specific attachment, car archive <car archive>, crt found' lcp systems, directory delt_<rel>/data
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