Hello Thomas Bernt,
Your observation seems right. Currently, if you add an OpenAccessDataSource to a Web Application, the Telerik.OpenAccess.Web.dll is added automatically. As you probably need to reference a class library with an OpenAccess class model, you need to manually add references to the Telerik.OpenAccess and Telerik.OpenAccess.35.Extensions assemblies if they are missing.
We are sorry for the inconvenience this might have caused you. We will take this into consideration.
the Telerik team
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