How to replace design file header
From time to time in a design file you may have trouble with certain tools and functions not working or working erratically. The file is not necessarily corrupted as it open in MicroStation but it is in fact not displaying consistent behavior. Replacing the design file header or placing the graphic in another file may help resolve this issue.
6. Click on Ok button (this dialog can be dismissed permanently by checking the "Do no display again" check box
This will merge the reference file into the new file and replace the original file header with the new header from this file