Solution : https://service.sap.com/sap/support/notes/526835 (SAP Service marketplace login required)
Key words : 
error overwriting                           existing installation directory07/jan/04    4      patch level 7 installation hints - updated19/dec/03    5      upgrade problems, longer required28/aug/02    2      wrong apache versions mentioned02/jun/02    2      reset, 1     pre installation2     installation3     post installation4     patch installation5     upgrade 6, exe '-x' '-v' '-g' '-i' '-n' '-r' ', pid` kill -2 `cat <its_instdir>/<vits>/traces/agate0/, ini----28/aug/02----wrong apache versions mentioned----------------------, kill -2 `cat <its_instdir>/<vits>/traces/mmanager/, sap@web studio uninstall30/oct/03    5      error upgrading, important wgate considerations08/sep/03    2      problems witch watchdog, ---07/jan/04----patch level 7 installation hints - updated-------------
Related Notes : 
       
| 743391 | SAP SCM 4.0 SP stack 07/2004: Release & information note | 
| 722890 | SAPinst or process started by SAPinst terminates abnormally | 
| 722062 | SAP SCM 4.0 SP stack 04/2004: Release & information note | 
| 711292 | SAP SCM 4.0 SP stack 03/2004: Release & information note | 
| 696859 | SAP SCM 4.0 SP stack 02/2004: Release & information note | 
| 689455 | SAP SCM 4.0 SP08: Release and information note | 
| 677385 | SAP SCM 4.0 SP07: SAP SCM BASIS 4.0 (SAPK-40007INSCMBASIS) | 
| 658298 | UNIX: Installation crashes immediately after start | 
| 646419 | Iacor error during publishing due to incorrect file rights | 
| 618173 | Using SAP Kernel 6.20 on Red Hat Enterprise Linux 2.1 | 
| 336884 | IACOR in ITS Dual Host Installations | 
| 335521 | ITS patch installation of kernel files | 
| 331407 | ITS patch installation of SAR packages (IAC packages) | 
| 325149 | Publishing IAC objects |