Warnings that are related to selected elements in the drawing area can be exported to a separate file using 
on the Autodesk Revit 2014 dialog. See Warnings for Selected Elements. This can be useful, if you want to have the warnings listed next to a project as you work on it.
To export warnings to a separate file
- In the dialog, click .
- In the Export Revit Error Report dialog, browse to the location where you want to store this file.
- Click Save to save the file.
- Click Close to close the dialog.
Note: Warnings are exported in HTML format, but they can be opened in an Excel format for more advanced data manipulation.