DECLINED: This is a limitation of the DataSet model. The last section "Updating the database" of this help article http://www.telerik.com/help/winforms/scheduler-data-binding-data-binding-walkthrough.html explains how you can overcome this.

1. Create a new project with RadScheduler.
2. Follow the instructions in our sample-database example help article to create a sample database.
3. Set GroupType property to Resource.
4. Add some resources
5. Run the application, try to add some appointments and to save them.