Problem only occurs with personal geodatabase (MDB) feature classes.Workaround I:1. Add CAD Fields. 2. Open properties of Feature Class, Fields tab. 3. Rename Level to Level_ (reserved word)4. Set Alias to Level5. Edit fields. 6. Before Export to CAD, use Set CAD Alias, and set Level_ alias to Level. Workaround II:Copy the feature class to new feature class, and the above Step 3 will be done automatically. This way steps 4 ~ 6 are not necessary.Workaround III:Export the SDE or PGDB feature class to a file geodatabase. Run the ADD CAD Fields and populate the following fields with these values:Level = 0Color = 5Layer = DefaultRun the Export to CAD tool and choose the DGN v8 format.