add read only tree table and value help

bookshop/srv/admin-service.cds

@@ -2,4 +2,5 @@ using { sap.capire.bookshop as my } from '../db/schema';
 service AdminService @(requires:'admin', path:'/admin') {
   entity Books as projection on my.Books;
   entity Authors as projection on my.Authors;
+  entity GenreHierarchy as projection on my.Genres
 }

bookshop/srv/cat-service.cds

@@ -1,4 +1,7 @@
 using { sap.capire.bookshop as my } from '../db/schema';
+using {my.common.Hierarchy as Hierarchy} from './hierarchy';
+
+extend my.Genres with Hierarchy;
 service CatalogService @(path:'/browse') {
 
   /** For displaying lists of Books */
@@ -10,6 +13,9 @@ service CatalogService @(path:'/browse') {
     author.name as author
   } excluding { createdBy, modifiedBy };
 
+  @readonly
+  entity GenreHierarchy as projection on my.Genres;
+
   @requires: 'authenticated-user'
   action submitOrder ( book: Books:ID, quantity: Integer ) returns { stock: Integer };
   event OrderedBook : { book: Books:ID; quantity: Integer; buyer: String };

bookshop/srv/hierarchy.cds

@@ -0,0 +1,29 @@
+namespace my.common;
+
+aspect Hierarchy {
+  virtual LimitedDescendantCount : Integer64;
+  virtual DistanceFromRoot       : Integer64;
+  virtual DrillState             : String;
+  virtual Matched                : Boolean;
+  virtual MatchedDescendantCount : Integer64;
+  virtual LimitedRank            : Integer64;
+}
+
+
+annotate Hierarchy with @Capabilities.FilterRestrictions.NonFilterableProperties: [
+  'LimitedDescendantCount',
+  'DistanceFromRoot',
+  'DrillState',
+  'Matched',
+  'MatchedDescendantCount',
+  'LimitedRank'
+];
+
+annotate Hierarchy with @Capabilities.SortRestrictions.NonSortableProperties: [
+  'LimitedDescendantCount',
+  'DistanceFromRoot',
+  'DrillState',
+  'Matched',
+  'MatchedDescendantCount',
+  'LimitedRank'
+];