diff --git a/demo-shell/src/app/components/permissions/demo-permissions.component.ts b/demo-shell/src/app/components/permissions/demo-permissions.component.ts
index 49455b8c51..87576ec947 100644
--- a/demo-shell/src/app/components/permissions/demo-permissions.component.ts
+++ b/demo-shell/src/app/components/permissions/demo-permissions.component.ts
@@ -73,7 +73,7 @@ export class DemoPermissionComponent implements OnInit {
 
     showErrorMessage(error) {
         this.notificationService.openSnackMessage(
-            JSON.parse(error.response.text).error.errorKey,
+            error,
             4000
         );
     }
diff --git a/docs/content-services/add-permission-panel.component.md b/docs/content-services/add-permission-panel.component.md
index c5126feaa6..479e7bd0bb 100644
--- a/docs/content-services/add-permission-panel.component.md
+++ b/docs/content-services/add-permission-panel.component.md
@@ -1,12 +1,12 @@
 ---
 Added: v2.4.0
 Status: Active
-Last reviewed: 2018-05-04
+Last reviewed: 2018-05-03
 ---
 
 # Add Permission Component
 
-Searches for people or groups to add to the current node permissions.
+Allow user to search people or group that could be added to the current node permissions.
 
 ![Add Permission Component](../docassets/images/add-permission-component.png)
 
@@ -14,20 +14,24 @@ Searches for people or groups to add to the current node permissions.
 
 ```html
 <adf-add-permission [nodeId]="nodeId"
-    (success)="onSuccess($event)" (error)="onError($event)">
+                    (success)="onSuccess($event)" (error)="onError($event)">
 </adf-add-permission>
 ```
 
 ## Class members
 
+### Properties
+
+| Name | Type | Default value | Description |
+| -- | -- | -- | -- |
+
 ### Events
 
 | Name | Type | Description |
 | -- | -- | -- |
-| select | `EventEmitter<any>` | Emitted when a permission list item is selected. |
+| select | `EventEmitter<MinimalNodeEntryEntity>` |  |
 
 ## Details
-
 This component uses a [Search component](../search.component.md) to retrieve the
 groups and people that could be added to the permission list of the current node.
-The `select` event is emitted when a result is clicked from the list.
+The `select` event will be emitted when a result is clicked from the list.
\ No newline at end of file
diff --git a/lib/content-services/i18n/en.json b/lib/content-services/i18n/en.json
index 646c62b803..fdeb118602 100644
--- a/lib/content-services/i18n/en.json
+++ b/lib/content-services/i18n/en.json
@@ -264,14 +264,17 @@
       "ROLE": "Role",
       "LOCALLY_SET": "Locally set",
       "NO_PERMISSIONS": "No permissions"
-      },
-      "ADD-PERMISSION": {
-        "SEARCH" : "Search",
-        "TYPE-MESSAGE" : "Type something to start searching groups or people",
-        "NO-RESULT": "No result found for this search",
-        "ADD-ACTION" : "ADD",
-        "CLOSE-ACTION" : "CLOSE",
-        "BASE-DIALOG-TITLE" : "Search a group or people to add..."
-      }
+    },
+    "ADD-PERMISSION": {
+      "SEARCH": "Search",
+      "TYPE-MESSAGE": "Type something to start searching groups or people",
+      "NO-RESULT": "No result found for this search",
+      "ADD-ACTION": "ADD",
+      "CLOSE-ACTION": "CLOSE",
+      "BASE-DIALOG-TITLE": "Search a group or people to add..."
+    },
+    "ERROR": {
+      "DUPLICATE-PERMISSION": "One or more of the permission you set is already present : {{list}}"
+    }
   }
 }
diff --git a/lib/content-services/permission-manager/components/add-permission/add-permission-dialog.component.ts b/lib/content-services/permission-manager/components/add-permission/add-permission-dialog.component.ts
index 2c0270fa0d..c41d208557 100644
--- a/lib/content-services/permission-manager/components/add-permission/add-permission-dialog.component.ts
+++ b/lib/content-services/permission-manager/components/add-permission/add-permission-dialog.component.ts
@@ -32,7 +32,7 @@ export class AddPermissionDialogComponent {
     @ViewChild('addPermission')
     addPermissionComponent: AddPermissionComponent;
 
-    currentSelection: MinimalNodeEntity[] = [];
+    private currentSelection: MinimalNodeEntity[] = [];
 
     constructor(@Inject(MAT_DIALOG_DATA) public data: AddPermissionDialogData) {
     }
diff --git a/lib/content-services/permission-manager/services/node-permission.service.spec.ts b/lib/content-services/permission-manager/services/node-permission.service.spec.ts
index 588f80426a..6e443caae2 100644
--- a/lib/content-services/permission-manager/services/node-permission.service.spec.ts
+++ b/lib/content-services/permission-manager/services/node-permission.service.spec.ts
@@ -148,4 +148,35 @@ describe('NodePermissionService', () => {
         });
     }));
 
+    it('should be fail when user select the same authority and role to add', async(() => {
+        const fakeNodeCopy = Object.assign(fakeNodeWithOnlyLocally);
+
+        const fakeDuplicateAuthority: any = [{
+            'entry': {
+                'isFolder': false,
+                'search': {
+                    'score': 0.3541112
+                },
+                'isFile': false,
+                'name': 'GROUP_EVERYONE',
+                'location': 'nodes',
+                'id': 'GROUP_EVERYONE',
+                'nodeType': 'cm:authorityContainer',
+                'properties': {
+                    'cm:authorityName': 'GROUP_EVERYONE'
+                },
+                'parentId': '030d833e-da8e-4f5c-8ef9-d809638bd04b'
+            }
+        }];
+
+        service.updateLocallySetPermissions(fakeNodeCopy, fakeDuplicateAuthority, ['Contributor'])
+            .subscribe((node: MinimalNodeEntryEntity) => {
+
+            }, (errorMessage) => {
+                expect(errorMessage).not.toBeNull();
+                expect(errorMessage).toBeDefined();
+                expect(errorMessage).toBe('PERMISSION_MANAGER.ERROR.DUPLICATE-PERMISSION');
+            });
+    }));
+
 });
diff --git a/lib/content-services/permission-manager/services/node-permission.service.ts b/lib/content-services/permission-manager/services/node-permission.service.ts
index 357b5e6202..c16bc6f9ca 100644
--- a/lib/content-services/permission-manager/services/node-permission.service.ts
+++ b/lib/content-services/permission-manager/services/node-permission.service.ts
@@ -17,7 +17,7 @@
 
 import { Injectable } from '@angular/core';
 import { Observable } from 'rxjs/Observable';
-import { AlfrescoApiService, SearchService, NodesApiService } from '@alfresco/adf-core';
+import { AlfrescoApiService, SearchService, NodesApiService, TranslationService } from '@alfresco/adf-core';
 import { QueryBody, MinimalNodeEntryEntity, MinimalNodeEntity, PathElement, GroupMemberEntry, GroupsPaging, GroupMemberPaging, PermissionElement } from 'alfresco-js-api';
 import 'rxjs/add/operator/switchMap';
 import { of } from 'rxjs/observable/of';
@@ -28,7 +28,8 @@ export class NodePermissionService {
 
     constructor(private apiService: AlfrescoApiService,
                 private searchApiService: SearchService,
-                private nodeService: NodesApiService) {
+                private nodeService: NodesApiService,
+                private translation: TranslationService) {
     }
 
     /**
@@ -56,7 +57,6 @@ export class NodePermissionService {
      * @returns Node with updated permission
      */
     updatePermissionRole(node: MinimalNodeEntryEntity, updatedPermissionRole: PermissionElement): Observable<MinimalNodeEntryEntity> {
-
         let permissionBody = { permissions: { locallySet: []} };
         const index = node.permissions.locallySet.map((permission) => permission.authorityId).indexOf(updatedPermissionRole.authorityId);
         permissionBody.permissions.locallySet = permissionBody.permissions.locallySet.concat(node.permissions.locallySet);
@@ -82,10 +82,33 @@ export class NodePermissionService {
     updateLocallySetPermissions(node: MinimalNodeEntryEntity, nodes: MinimalNodeEntity[], nodeRole: string[]): Observable<MinimalNodeEntryEntity> {
         let permissionBody = { permissions: { locallySet: []} };
         const permissionList = this.transformNodeToPermissionElement(nodes, nodeRole[0]);
+        const duplicatedPermissions = this.getDuplicatedPermissions(node.permissions.locallySet, permissionList);
+        if (duplicatedPermissions.length > 0) {
+            const list = duplicatedPermissions.map((permission) => 'authority -> ' + permission.authorityId + ' / role -> ' + permission.name).join(', ');
+            const duplicatePermissionMessage: string = this.translation.instant('PERMISSION_MANAGER.ERROR.DUPLICATE-PERMISSION',  {list});
+            return Observable.throw(duplicatePermissionMessage);
+        }
         permissionBody.permissions.locallySet = node.permissions.locallySet ? node.permissions.locallySet.concat(permissionList) : permissionList;
         return this.nodeService.updateNode(node.id, permissionBody);
     }
 
+    private getDuplicatedPermissions(nodeLocallySet: PermissionElement[], permissionListAdded: PermissionElement[]): PermissionElement[] {
+        let duplicatePermissions: PermissionElement[] = [];
+        permissionListAdded.forEach((permission: PermissionElement) => {
+            const duplicate = nodeLocallySet.find((localPermission) => this.isEqualPermission(localPermission, permission));
+            if (duplicate) {
+                duplicatePermissions.push(duplicate);
+            }
+        });
+        return duplicatePermissions;
+    }
+
+    private isEqualPermission(oldPermission: PermissionElement, newPermission: PermissionElement): boolean {
+        return oldPermission.accessStatus === newPermission.accessStatus &&
+               oldPermission.authorityId === newPermission.authorityId &&
+               oldPermission.name === newPermission.name;
+    }
+
     private transformNodeToPermissionElement(nodes: MinimalNodeEntity[], nodeRole: any): PermissionElement[] {
         return nodes.map((node) => {
             let newPermissionElement: PermissionElement = <PermissionElement> {