Data Access has been discontinued. Please refer to this page for more information.

The Discriminator Value Of The Persistent Type Is Already Used

This article is relevant to entity models that utilize the deprecated Visual Studio integration of Telerik Data Access. The current documentation of the Data Access framework is available here.

This error occurs when two or more persistent classes that participate in an inheritance hierarchy have duplicated discriminator values.


To resolve this error, enter a unique discriminator value:

  1. Double-click the warning to open the Validation Dialog.
  2. Specify a discriminator value for the persistent class.

Further References