Oracle Error Message
RMAN-05517: tempfile string conflicts with file used by target database
Reason for the Error
RMAN attempted to use the specified tempfile as a restore destination in the auxiliary database, but this name was already in use by the target database.
Solution
Use the SET NEWNAME FOR TEMPFILE command to specify a name for the indicated tempfile, making sure that the new name does not conflict with a file name in use by target database. Alternatively, use DB_FILE_NAME_CONVERT and retry the command.