You will have to rebuild the project that contains your RLINQ model before Add OpenAccess Service wizard will be able to see the changes that you have made.
Additionally there can be other issues with the types that you are trying to expose. You can check the validation messages that Add OpenAccess Service wizard generates for each entity that does not pass the validation step by hovering the entity row and inspecting the message in the tooltip that appears.
There is one more thing to consider when working with views - you will not be able to insert, update and delete any items coming from the views.
Please let us know if you were able to resolve the issue and if you need any further assistance you are welcome to ask your questions either here in the forums or in our customer support system.
the Telerik team