login properties - cannot alter the user 'dbo'

I'm using Sql Server Express 2008 and trying to set the login properties for a database I just attached.

I selecrted my login user went to the server mappings and when I click okay, I get the error:

"Cannot alter the user 'dbo'"

Any help is appreciated.
Who is Participating?
Raja Jegan RConnect With a Mentor SQL Server DBA & ArchitectCommented:
Use sp_changedbowner to a new user or sa like this to fix it out..

exec sp_changedbowner 'sa'

or some other login instead of sa to fix it out.
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