Resolution
The Project Server administrator must complete the following steps:
1. Launch Microsoft Project Professional and log into Project Server with administrator permissions
2. Click Tools - Enterprise Options - Open Enterprise Global
3. Click Tools - Organizer
4. Select the Fields tab
5. From the list on the right, select the unwanted field or outline code and then click the Delete button
6. Click the Close button
7. Save and close the Enterprise Global
8. Exit Microsoft Project and relaunch the software, and then log into Project Server again