title: Error while removing project dependency in VS2010
body: <p>I have a large solution with number of projects.
  Some the projects depend on others (never a circular dependency though). </p>
  
  <p>When I tried to remove a dependency of a project, I am getting an error message like "The dependency was added by the project system and cannot be removed". What is the cause for this error? How I can solve this?</p>