Online maintenance overlap for database on Exchange 2007

Hi;
I periodically receive "There is an online maintenance overlap for database..." warning on Exchange 2007 application log.  I have changed my custom schedule for online maintenance but still see it, any idea to fix it?

I have two different database for two different storage groups - Manager.edb and Staff.edb

The schedule of maintenance for Manager.edb is Monday, Wednesday, Friday, 12AM - 4AM
The schedule of maintenance for Staff.edb is Sunday, Tuesday, Thursday, 1AM - 5AM
For Public Folder, the schedule is on Sunday 5pm.

I do not understand why the message still logged in application log.
LVL 1
KANEWONGAsked:
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Exchange_GeekCommented:
Please paste that message here.

Thanks.
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KANEWONGAuthor Commented:
sorry, i cleared the log.  Usually, it will show once a week, i will post if I see it again.
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Exchange_GeekCommented:
Thanks i would wait for that message to appear.


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KANEWONGAuthor Commented:
Hi;

the message is

There is an online maintenance overlap for database "Storage Group Standard\Staff". Please revise the online maintenance schedule.
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Exchange_GeekCommented:
If it is similar to the following link, be rest assured this wont cause any harm - infact you may want to ignore this just a noise created by Exchange for trivial reasons.

http://forums.msexchange.org/Event_ID_9871/m_1800492368/tm.htm
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