instance based restriction in catalogservice

packages/bookshop/srv/cat-service.cds

@@ -11,3 +11,7 @@ service CatalogService {
   @insertonly entity Orders as projection on my.Orders;
 
 }
+// Example for an instance restriction
+ annotate CatalogService.Orders with  @(restrict: [
+   { grant: 'READ', where: 'currency_code = $user.currency'  } 
+  ]);