Oracle is Not Compatible with Oracle

Just a short blog entry about a funny error message I’ve got while trying to activate a physical standby database:

SQL> alter database recover managed standby database finish skip standby logfile;
alter database recover managed standby database finish skip standby logfile
*
ERROR at line 1:
ORA-00283: recovery session canceled due to errors
ORA-01110: data file 1: '/oradata/stage/datafile/system_01.dbf'
ORA-01122: database file 1 failed verification check
ORA-01110: data file 1: '/oradata/stage/datafile/system_01.dbf'
ORA-01130: database file version 9.2.0.0.0 incompatible with ORACLE
version 9.2.0.0.0

Database file version 9.2.0.0.0 is incompatible with ORACLE version 9.2.0.0.0, is it?