Report Builder 2.0 loses parameter Null default value when deployed

When a parameter is set to a default value of (Null) and the report is saved to the sever, the default is lost when the report is re-opened in RB2.  This problem doesn't seem to occur in BIDS.  I've tried to use an expression to set the value to System.DBNull but this can no longer be done.
Any ideas for a work-around?
Is there a bug report open for this?  I couldn't find an open bug on the Connections site and there's an issue on that site right now when submitting feedback.Paul Turley [Hitachi Consulting]
SQLServerBIBlog.com

Hi All,
I just had an almost identical issue using report builder 3.0 so I don't believe it is fixed. I had 4 parameters set to default to (Null) and I added a new one with identical settings but it would continually come up blank and not check the null box automatically
when going into my sub report.
To make matters worse I experimented changing one of the old parameters and it then started exhibiting the same behaviour. Using Luke's post above solved the issue (though it was Manage in my version not Administrate).
Using System.DBNull.Value resulted in it being treated as a literal string "System.DBNull.Value" and putting that in the filter for me.
Hope it helps.

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