Hello Natalia,
yes, I already checked this note. As I already said I tried the systemcopy with 7.8 also but getting the same error.
Note 1469675 implies that I have to use 7.7 for the systemcopy and upgrade to 7.8 afterwards. That worked fine for another system (same version of J2EE engine and OS).
This is the sapinst_dev.log:
WARNING[E] 2013-02-18 14:53:05.540 [iaxabactorext.cpp:465]
CIaSdbActorExt::sdbSessionExecute_impl
MDB-07001 No action defined for actor.
WARNING[E] 2013-02-18 14:53:05.540
CJSlibModule::writeError_impl()
The dbmcli call for action DB_CREATE failed. SOLUTION: Check the logfile XCMDOUT.LOG.
TRACE 2013-02-18 14:53:05.540 [iaxxejsbas.hpp:408]
handleException<ESAPinstJSError>()
Converting exception into JS Exception EJSException.
TRACE 2013-02-18 14:53:05.540
Function setMessageIdOfExceptionMessage: dbmodada.actorext.dbmcliCallFailed
WARNING[E] 2013-02-18 14:53:05.540
CJSlibModule::writeError_impl()
The dbmcli call for action DB_CREATE failed. SOLUTION: Check the logfile XCMDOUT.LOG.
TRACE 2013-02-18 14:53:05.540 [iaxxejsbas.hpp:483]
EJS_Base::dispatchFunctionCall()
JS Callback has thrown unknown exception. Rethrowing.