You are right, with renaming a base class field is problematic with horizontal inheritance and might require deleting the whole entity and re-creating it. You can delete only the inheritance relationship as well but only prior to renaming the property. After doing all the required operations you can re-create the inheritance relation. All these problems should be there only in the cases where you have horizontal inheritance strategy, vertical and flat should not have any impact from editing the base class.
These issues are known to us but, we have not addressed them yet as there is some higher priority development at the moment and the workarounds are available. However you can be sure that all these issues will be addressed for one of our next releases in the near future. I sincerely apologize for the headaches they might have caused you.
All the best,
the Telerik team
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