diff --git a/src/app/admin/admin-notify-dashboard/models/admin-notify-message-search-result.model.ts b/src/app/admin/admin-notify-dashboard/models/admin-notify-message-search-result.model.ts
index 51151189936..c4df75ef3ee 100644
--- a/src/app/admin/admin-notify-dashboard/models/admin-notify-message-search-result.model.ts
+++ b/src/app/admin/admin-notify-dashboard/models/admin-notify-message-search-result.model.ts
@@ -1,7 +1,5 @@
 import { SearchResult } from '../../../shared/search/models/search-result.model';
-import { searchResultFor } from '../../../shared/search/search-result-element-decorator';
 import { AdminNotifyMessage } from './admin-notify-message.model';
 
-@searchResultFor(AdminNotifyMessage)
 export class AdminNotifySearchResult extends SearchResult<AdminNotifyMessage> {
 }
diff --git a/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workflow-item/workflow-item-search-result-admin-workflow-list-element.component.ts b/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workflow-item/workflow-item-search-result-admin-workflow-list-element.component.ts
index 2bb6dbb32a3..60740fb34b8 100644
--- a/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workflow-item/workflow-item-search-result-admin-workflow-list-element.component.ts
+++ b/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workflow-item/workflow-item-search-result-admin-workflow-list-element.component.ts
@@ -8,7 +8,10 @@ import {
   OnInit,
 } from '@angular/core';
 import { TranslateModule } from '@ngx-translate/core';
-import { Observable } from 'rxjs';
+import {
+  BehaviorSubject,
+  Observable,
+} from 'rxjs';
 
 import {
   APP_CONFIG,
@@ -20,7 +23,7 @@ import { RemoteData } from '../../../../../core/data/remote-data';
 import { Context } from '../../../../../core/shared/context.model';
 import { Item } from '../../../../../core/shared/item.model';
 import {
-  getAllSucceededRemoteData,
+  getFirstCompletedRemoteData,
   getRemoteDataPayload,
 } from '../../../../../core/shared/operators';
 import { ViewMode } from '../../../../../core/shared/view-mode.model';
@@ -49,7 +52,7 @@ export class WorkflowItemSearchResultAdminWorkflowListElementComponent extends S
   /**
    * The item linked to the workflow item
    */
-  public item$: Observable<Item>;
+  public item$: BehaviorSubject<Item> = new BehaviorSubject<Item>(undefined);
 
   constructor(private linkService: LinkService,
               protected truncatableService: TruncatableService,
@@ -65,6 +68,11 @@ export class WorkflowItemSearchResultAdminWorkflowListElementComponent extends S
   ngOnInit(): void {
     super.ngOnInit();
     this.dso = this.linkService.resolveLink(this.dso, followLink('item'));
-    this.item$ = (this.dso.item as Observable<RemoteData<Item>>).pipe(getAllSucceededRemoteData(), getRemoteDataPayload());
+    (this.dso.item as Observable<RemoteData<Item>>).pipe(
+      getFirstCompletedRemoteData(),
+      getRemoteDataPayload())
+      .subscribe((item: Item) => {
+        this.item$.next(item);
+      });
   }
 }
diff --git a/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workspace-item/workspace-item-search-result-admin-workflow-list-element.component.ts b/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workspace-item/workspace-item-search-result-admin-workflow-list-element.component.ts
index 3fce9ebdab4..7cf63a603b1 100644
--- a/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workspace-item/workspace-item-search-result-admin-workflow-list-element.component.ts
+++ b/src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workspace-item/workspace-item-search-result-admin-workflow-list-element.component.ts
@@ -31,7 +31,6 @@ import { Context } from '../../../../../core/shared/context.model';
 import { DSpaceObject } from '../../../../../core/shared/dspace-object.model';
 import { Item } from '../../../../../core/shared/item.model';
 import {
-  getAllSucceededRemoteData,
   getFirstCompletedRemoteData,
   getRemoteDataPayload,
 } from '../../../../../core/shared/operators';
@@ -63,7 +62,7 @@ export class WorkspaceItemSearchResultAdminWorkflowListElementComponent extends
   /**
    * The item linked to the workflow item
    */
-  public item$: Observable<Item>;
+  public item$: BehaviorSubject<Item> = new BehaviorSubject<Item>(undefined);
 
   /**
    * The id of the item linked to the workflow item
@@ -90,11 +89,14 @@ export class WorkspaceItemSearchResultAdminWorkflowListElementComponent extends
   ngOnInit(): void {
     super.ngOnInit();
     this.dso = this.linkService.resolveLink(this.dso, followLink('item'));
-    this.item$ = (this.dso.item as Observable<RemoteData<Item>>).pipe(getAllSucceededRemoteData(), getRemoteDataPayload());
+    const item$ = (this.dso.item as Observable<RemoteData<Item>>).pipe(getFirstCompletedRemoteData(), getRemoteDataPayload());
 
-    this.item$.pipe(
+    item$.pipe(
       take(1),
-      tap((item: Item) => this.itemId = item.id),
+      tap((item: Item) => {
+        this.item$.next(item);
+        this.itemId = item.id;
+      }),
       mergeMap((item: Item) => this.retrieveSupervisorOrders(item.id)),
     ).subscribe((supervisionOrderList: SupervisionOrder[]) => {
       this.supervisionOrder$.next(supervisionOrderList);
diff --git a/src/app/app-routes.ts b/src/app/app-routes.ts
index ba322eef457..794d532176b 100644
--- a/src/app/app-routes.ts
+++ b/src/app/app-routes.ts
@@ -26,6 +26,7 @@ import { COMMUNITY_MODULE_PATH } from './community-page/community-page-routing-p
 import { AuthBlockingGuard } from './core/auth/auth-blocking.guard';
 import { AuthenticatedGuard } from './core/auth/authenticated.guard';
 import { GroupAdministratorGuard } from './core/data/feature-authorization/feature-authorization-guard/group-administrator.guard';
+import { SiteAdministratorGuard } from './core/data/feature-authorization/feature-authorization-guard/site-administrator.guard';
 import { SiteRegisterGuard } from './core/data/feature-authorization/feature-authorization-guard/site-register.guard';
 import { EndUserAgreementCurrentUserGuard } from './core/end-user-agreement/end-user-agreement-current-user.guard';
 import { ReloadGuard } from './core/reload/reload.guard';
@@ -155,7 +156,7 @@ export const APP_ROUTES: Route[] = [
         path: ADMIN_MODULE_PATH,
         loadChildren: () => import('./admin/admin-routes')
           .then((m) => m.ROUTES),
-        canActivate: [EndUserAgreementCurrentUserGuard],
+        canActivate: [SiteAdministratorGuard, EndUserAgreementCurrentUserGuard],
       },
       {
         path: NOTIFICATIONS_MODULE_PATH,
diff --git a/src/app/shared/object-collection/shared/claimed-task-search-result.model.ts b/src/app/shared/object-collection/shared/claimed-task-search-result.model.ts
index f8d07522457..8f580f19243 100644
--- a/src/app/shared/object-collection/shared/claimed-task-search-result.model.ts
+++ b/src/app/shared/object-collection/shared/claimed-task-search-result.model.ts
@@ -1,10 +1,8 @@
 import { ClaimedTask } from '../../../core/tasks/models/claimed-task-object.model';
 import { SearchResult } from '../../search/models/search-result.model';
-import { searchResultFor } from '../../search/search-result-element-decorator';
 
 /**
  * Represents a search result object of a ClaimedTask object
  */
-@searchResultFor(ClaimedTask)
 export class ClaimedTaskSearchResult extends SearchResult<ClaimedTask> {
 }
diff --git a/src/app/shared/object-collection/shared/collection-search-result.model.ts b/src/app/shared/object-collection/shared/collection-search-result.model.ts
index bd2f5478088..cff44c0ba20 100644
--- a/src/app/shared/object-collection/shared/collection-search-result.model.ts
+++ b/src/app/shared/object-collection/shared/collection-search-result.model.ts
@@ -1,7 +1,5 @@
 import { Collection } from '../../../core/shared/collection.model';
 import { SearchResult } from '../../search/models/search-result.model';
-import { searchResultFor } from '../../search/search-result-element-decorator';
 
-@searchResultFor(Collection)
 export class CollectionSearchResult extends SearchResult<Collection> {
 }
diff --git a/src/app/shared/object-collection/shared/community-search-result.model.ts b/src/app/shared/object-collection/shared/community-search-result.model.ts
index e80dfdaecf7..08127671753 100644
--- a/src/app/shared/object-collection/shared/community-search-result.model.ts
+++ b/src/app/shared/object-collection/shared/community-search-result.model.ts
@@ -1,7 +1,5 @@
 import { Community } from '../../../core/shared/community.model';
 import { SearchResult } from '../../search/models/search-result.model';
-import { searchResultFor } from '../../search/search-result-element-decorator';
 
-@searchResultFor(Community)
 export class CommunitySearchResult extends SearchResult<Community> {
 }
diff --git a/src/app/shared/object-collection/shared/item-search-result.model.ts b/src/app/shared/object-collection/shared/item-search-result.model.ts
index 5409bdbec7d..4704a9ffe68 100644
--- a/src/app/shared/object-collection/shared/item-search-result.model.ts
+++ b/src/app/shared/object-collection/shared/item-search-result.model.ts
@@ -2,10 +2,8 @@ import { GenericConstructor } from '../../../core/shared/generic-constructor';
 import { Item } from '../../../core/shared/item.model';
 import { inheritEquatable } from '../../../core/utilities/equals.decorators';
 import { SearchResult } from '../../search/models/search-result.model';
-import { searchResultFor } from '../../search/search-result-element-decorator';
 import { ListableObject } from './listable-object.model';
 
-@searchResultFor(Item)
 @inheritEquatable(SearchResult)
 export class ItemSearchResult extends SearchResult<Item> {
 
diff --git a/src/app/shared/object-collection/shared/pool-task-search-result.model.ts b/src/app/shared/object-collection/shared/pool-task-search-result.model.ts
index 9ee74bcd4b8..e6d06b4e666 100644
--- a/src/app/shared/object-collection/shared/pool-task-search-result.model.ts
+++ b/src/app/shared/object-collection/shared/pool-task-search-result.model.ts
@@ -1,10 +1,8 @@
 import { PoolTask } from '../../../core/tasks/models/pool-task-object.model';
 import { SearchResult } from '../../search/models/search-result.model';
-import { searchResultFor } from '../../search/search-result-element-decorator';
 
 /**
  * Represents a search result object of a PoolTask object
  */
-@searchResultFor(PoolTask)
 export class PoolTaskSearchResult extends SearchResult<PoolTask> {
 }
diff --git a/src/app/shared/object-collection/shared/workflow-item-search-result.model.ts b/src/app/shared/object-collection/shared/workflow-item-search-result.model.ts
index 8611f8678ac..431974cbcc4 100644
--- a/src/app/shared/object-collection/shared/workflow-item-search-result.model.ts
+++ b/src/app/shared/object-collection/shared/workflow-item-search-result.model.ts
@@ -1,10 +1,8 @@
 import { WorkflowItem } from '../../../core/submission/models/workflowitem.model';
 import { SearchResult } from '../../search/models/search-result.model';
-import { searchResultFor } from '../../search/search-result-element-decorator';
 
 /**
  * Represents a search result object of a WorkflowItem object
  */
-@searchResultFor(WorkflowItem)
 export class WorkflowItemSearchResult extends SearchResult<WorkflowItem> {
 }
diff --git a/src/app/shared/object-collection/shared/workspace-item-search-result.model.ts b/src/app/shared/object-collection/shared/workspace-item-search-result.model.ts
index 3f57d2f4cda..f0b65c4bd1c 100644
--- a/src/app/shared/object-collection/shared/workspace-item-search-result.model.ts
+++ b/src/app/shared/object-collection/shared/workspace-item-search-result.model.ts
@@ -1,10 +1,8 @@
 import { WorkspaceItem } from '../../../core/submission/models/workspaceitem.model';
 import { SearchResult } from '../../search/models/search-result.model';
-import { searchResultFor } from '../../search/search-result-element-decorator';
 
 /**
  * Represents a search result object of a WorkspaceItem object
  */
-@searchResultFor(WorkspaceItem)
 export class WorkspaceItemSearchResult extends SearchResult<WorkspaceItem> {
 }
diff --git a/src/app/shared/search/search-result-element-decorator.ts b/src/app/shared/search/search-result-element-decorator.ts
index 5241318122e..56d712ce269 100644
--- a/src/app/shared/search/search-result-element-decorator.ts
+++ b/src/app/shared/search/search-result-element-decorator.ts
@@ -1,24 +1,36 @@
+import { AdminNotifyMessage } from '../../admin/admin-notify-dashboard/models/admin-notify-message.model';
+import { AdminNotifySearchResult } from '../../admin/admin-notify-dashboard/models/admin-notify-message-search-result.model';
+import { Collection } from '../../core/shared/collection.model';
+import { Community } from '../../core/shared/community.model';
 import { GenericConstructor } from '../../core/shared/generic-constructor';
+import { Item } from '../../core/shared/item.model';
+import { WorkflowItem } from '../../core/submission/models/workflowitem.model';
+import { WorkspaceItem } from '../../core/submission/models/workspaceitem.model';
+import { ClaimedTask } from '../../core/tasks/models/claimed-task-object.model';
+import { PoolTask } from '../../core/tasks/models/pool-task-object.model';
+import { ClaimedTaskSearchResult } from '../object-collection/shared/claimed-task-search-result.model';
+import { CollectionSearchResult } from '../object-collection/shared/collection-search-result.model';
+import { CommunitySearchResult } from '../object-collection/shared/community-search-result.model';
+import { ItemSearchResult } from '../object-collection/shared/item-search-result.model';
 import { ListableObject } from '../object-collection/shared/listable-object.model';
+import { PoolTaskSearchResult } from '../object-collection/shared/pool-task-search-result.model';
+import { WorkflowItemSearchResult } from '../object-collection/shared/workflow-item-search-result.model';
+import { WorkspaceItemSearchResult } from '../object-collection/shared/workspace-item-search-result.model';
 
 /**
  * Contains the mapping between a search result component and a DSpaceObject
  */
-const searchResultMap = new Map();
+export const SEARCH_RESULT_MAP = new Map<string| GenericConstructor<ListableObject>, GenericConstructor<ListableObject>>([
+  [AdminNotifyMessage, AdminNotifySearchResult],
+  [ClaimedTask, ClaimedTaskSearchResult],
+  [PoolTask, PoolTaskSearchResult],
+  [Collection, CollectionSearchResult],
+  [Community, CommunitySearchResult],
+  [Item, ItemSearchResult],
+  [WorkflowItem, WorkflowItemSearchResult],
+  [WorkspaceItem, WorkspaceItemSearchResult],
+]);
 
-/**
- * Used to map Search Result components to their matching DSpaceObject
- * @param {GenericConstructor<ListableObject>} domainConstructor The constructor of the DSpaceObject
- * @returns Decorator function that performs the actual mapping on initialization of the component
- */
-export function searchResultFor(domainConstructor: GenericConstructor<ListableObject>) {
-  return function decorator(searchResult: any) {
-    if (!searchResult) {
-      return;
-    }
-    searchResultMap.set(domainConstructor, searchResult);
-  };
-}
 
 /**
  * Requests the matching component based on a given DSpaceObject's constructor
@@ -26,5 +38,5 @@ export function searchResultFor(domainConstructor: GenericConstructor<ListableOb
  * @returns The component's constructor that matches the given DSpaceObject
  */
 export function getSearchResultFor(domainConstructor: GenericConstructor<ListableObject>) {
-  return searchResultMap.get(domainConstructor);
+  return SEARCH_RESULT_MAP.get(domainConstructor);
 }