title: SSIS adding an existed package actually added an identical copy
body: <p>I try to add an existed package to a SSIS project using Visual Studio.  But it turns out the tool copies the package to a new package and name it as original name plus an incremented number first and then attach the package to the project.  I know I miss some settings.  But I could not find out what prevents the original package from attached.  Anyone encountered the same problem.  Thanks!</p>