Solution : https://service.sap.com/sap/support/notes/1687484 (SAP Service marketplace login required)
Key words : 
system administration -> support -> portal content directory -> pcd inspector2, config\config\local\data\portalpcd inspector, config\config\local\meta\libpcd\, ep-km-adm-upg component, sys\global\config\cm\config, proper configuration backup procedure, pcd inspector check, data base storage, cm repository manager, kmc configuration correctly
Related Notes : 
       
| 1691956 | |
| 1571384 | |
| 1390477 | Additional info about the upgrade to SAP NetWeaver 7.3 | 
| 1000150 | Backup of KMC configuration |