Solution : https://service.sap.com/sap/support/notes/551542 (SAP Service marketplace login required)
Key words : 
oracle installationoracle migrationoracle patchset installationoracle patch installationoracle upgradeoracle downgradeoracle softwareoracle software relinking, current service>\bin\oradim -delete -sid <sid><oracle-home, registry \hkey_local_machine\system\currentcontolset\services\oracleservice<sid>, \\hkey_local_machine\system\system\currentcontrolset\services, oracle service versionthe source release, source release>\bin\oradim -, files\oracle\inventory\logs            unix, \hkey_local_machine\software\oracle main key, $oracle_home file system            note 499055 deals, source release  target release    supported
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