ORA-19909: datafile string belongs to an orphan

admin

ORA-19909: datafile string belongsto an orphan incarnation
Cause: Either the specified datafile was restored from abackup that was taken
during a period of time that has already been discarded by a RESETLOGS
operation, or Oracle cannot identify which database incarnation the filebelongs to.
The alert log contains more information.
Action: Restorea backup of this file that belongs to either the current or a prior
incarnation of the database. If you are using RMAN to restore, RMAN will
automatically select a correct backup.