This problem has been fixed and the fix will be part of the Q3 release, expected later this week.
However, you should be able to fix the error even now, without upgrading to the new version. Just double-click on the association to open the Association Editor and correct the mapping between the columns of the two tables, probably at the moment the ParentId column is used for a second time, instead of the SurveyId column.
After saving the changes the error should go away. I hope that helps.
the Telerik team
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