Backup history file error

For some time, error with backup history file is repeating. For example, I have MaxDB 7.9.07.10 on Suse SLES 11SP02. In Database Studio when I want to open backups I get error message:

The backup history file /sapdb/AED/data/wrk/AED/dbm.knl is corrupted in line 231

-24763,ERR_BHIST_INVALID_ENTRY: The line "5251A5280245|DAT_000000048|SAVE WARM|2013-10-06 20:00:08|2013-10-06 20:00:08|2013-10-06 20:00:10|2013-10-07 13:28:05|  19449604|          |NO |2_CompleteDataBackup                                            |  15867400|         1|      -903| " is an invalid line for the backup history

-24757,ERR_FORMAT_SEPARATORNOP: The separator '|' cannot be found 15 times within string "5251A5280245|DAT_000000048|SAVE WARM|2013-10-06 20:00:08|2013-10-06 20:00:08|2013-10-06 20:00:10|2013-10-07 13:28:05|  19449604|          |NO |2_CompleteDataBackup                                            |  15867400|         1|      -903| "

-24762,ERR_FORMAT_SEPARATORMISSING: String " " does not contain the expected separator '|'

The backup history file /sapdb/AED/data/wrk/AED/dbm.knl is corrupted in line 231

-24763,ERR_BHIST_INVALID_ENTRY: The line "5251A5280245|DAT_000000048|SAVE WARM|2013-10-06 20:00:08|2013-10-06 20:00:08|2013-10-06 20:00:10|2013-10-07 13:28:05|  19449604|          |NO |2_CompleteDataBackup                                            |  15867400|         1|      -903| " is an invalid line for the backup history

-24757,ERR_FORMAT_SEPARATORNOP: The separator '|' cannot be found 15 times within string "5251A5280245|DAT_000000048|SAVE WARM|2013-10-06 20:00:08|2013-10-06 20:00:08|2013-10-06 20:00:10|2013-10-07 13:28:05|  19449604|          |NO |2_CompleteDataBackup                                            |  15867400|         1|      -903| "

-24762,ERR_FORMAT_SEPARATORMISSING: String " " does not contain the expected separator '|'

When I check backup log in dbacockpit I see:

*** SAVE/RESTORE result:

ERR

-24988,ERR_SQL: SQL error

-903,Host file I/O error

3,Data backup failed

1,Backupmedium #1 (/mnt/backup/data/2_completeDataBackup.aed)                                     

Backup error occured, Error code 3700 "hostfile_error"

 

 

*** SAVE/RESTORE request:

SAVE DATA CANCEL

*** SAVE/RESTORE request accepted:

OK

 

 

*** SAVE/RESTORE result:

ERR

-24988,ERR_SQL: SQL error

-104,DBM command impossible at this time

 

 

*** DBA Action ends:

Timestamp: 20131230161007   State:    Failure

It disturbs our backup quite a bit, backup can't be continued until I manually delete wrong lines in file /sapdb/AED/data/wrk/AED/dbm.knl, for example:

5251A5280245|DAT_000000048|SAVE WARM|2013-10-06 20:00:08|2013-10-06 20:00:08|2013-10-06 20:00:10|2013-10-07 13:28:05|  19449604|          |NO |2_CompleteDataBackup

                           |  15867400|         1|      -903|^A^@^@^@^@^@^@^@305<U+05CD>^@^@^@^@^@ 1)322300^?^@^@'1)322300^?^@^@01)322300^?^@^@|

Is this MaxDB error or is there something I can do to stop this error happening again?