Cannot change the default database reference while designers are open.
SQL Server 2005
You cannot change the default database reference while using the designers to create or modify a query, view, inline function, or stored procedure. This warning occurs in two circumstances:
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You are changing the default database reference for a folder while some of the folder's documents are still open in the Query and View Designer.
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You are changing the default database reference for the entire project while some of the project's documents are still open in Query and View Designer.