Before this release, a tree view on a recursive association meant hand-writing the OData-level annotations yourself: @Aggregation.RecursiveHierarchy, an extension adding @Hierarchy.RecursiveHierarchy with computed columns, and @Capabilities filter/sort restrictions. @hierarchy on the entity now expands to all of that at compile time.
Guidance that says a Fiori tree view needs several hand-written OData annotations. Since December 2025 a single @hierarchy (optionally naming the association) is enough.