Over the last couple of weeks we have worked on several upgrades of our existing sites to Kentico 9, which was released last month. While the upgrade process overall went pretty smooth, one issue popped up in almost all of our cases. In our projects we tend to leverage page related views (View_[ClassName]_Joined) in repeaters/univiews with custom queries which are removed during the upgrade process. This post will give you insights on how we handled this.