diff --git a/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.html b/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.html
index c74006550c..ac0cdac1cc 100644
--- a/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.html
+++ b/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.html
@@ -7,15 +7,15 @@
   </p>
 
   <form (ngSubmit)="performAction()" *ngIf="ratingForm" [formGroup]="ratingForm">
-    <div *ngVar="ratingForm.get('review').touched && !ratingForm.get('review').valid as invalid" class="form-group">
+    <div class="form-group">
       <label class="control-label">
         <span>{{ 'advanced-workflow-action.rating.form.review.label' | translate }}</span>
         <span *ngIf="advancedInfo?.descriptionRequired">*</span>
       </label>
-      <textarea [ngClass]="invalid ? 'is-invalid' : ''" [required]="advancedInfo?.descriptionRequired"
-                class="form-control" formControlName="review">
+      <textarea [ngClass]="{ 'is-invalid' : isInvalid('review') }"
+                [required]="advancedInfo?.descriptionRequired" class="form-control" formControlName="review">
       </textarea>
-      <small *ngIf="invalid" class="invalid-feedback d-block">
+      <small *ngIf="isInvalid('review')" class="invalid-feedback d-block">
         {{ 'advanced-workflow-action.rating.form.review.error' | translate }}
       </small>
     </div>
@@ -24,8 +24,12 @@
       <label class="control-label">
         {{ 'advanced-workflow-action.rating.form.rating.label' | translate }}*
       </label>
-      <rating [max]="advancedInfo?.maxValue" class="d-block" formControlName="rating">
+      <rating [max]="advancedInfo?.maxValue" [ngClass]="{ 'text-danger': isInvalid('rating') }"
+              class="d-block" formControlName="rating">
       </rating>
+      <small *ngIf="isInvalid('rating')" class="invalid-feedback d-block">
+        {{ 'advanced-workflow-action.rating.form.rating.error' | translate }}
+      </small>
     </div>
   </form>
 
diff --git a/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.ts b/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.ts
index f98e83f8be..8a84801fda 100644
--- a/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.ts
+++ b/src/app/workflowitems-edit-page/advanced-workflow-action/advanced-workflow-action-rating/advanced-workflow-action-rating.component.ts
@@ -3,11 +3,9 @@ import {
   rendersAdvancedWorkflowTaskOption
 } from '../../../shared/mydspace-actions/claimed-task/switcher/claimed-task-actions-decorator';
 import { AdvancedWorkflowActionComponent } from '../advanced-workflow-action/advanced-workflow-action.component';
-import { FormGroup, FormControl } from '@angular/forms';
+import { FormGroup, FormControl, Validators } from '@angular/forms';
 import { WorkflowAction } from '../../../core/tasks/models/workflow-action-object.model';
-import {
-  RatingAdvancedWorkflowInfo
-} from '../../../core/tasks/models/rating-advanced-workflow-info.model';
+import { RatingAdvancedWorkflowInfo } from '../../../core/tasks/models/rating-advanced-workflow-info.model';
 
 export const ADVANCED_WORKFLOW_TASK_OPTION_RATING = 'submit_score';
 export const ADVANCED_WORKFLOW_ACTION_RATING = 'scorereviewaction';
@@ -30,7 +28,7 @@ export class AdvancedWorkflowActionRatingComponent extends AdvancedWorkflowActio
     super.ngOnInit();
     this.ratingForm = new FormGroup({
       review: new FormControl(''),
-      rating: new FormControl(0),
+      rating: new FormControl(0, Validators.min(1)),
     });
   }
 
@@ -69,4 +67,13 @@ export class AdvancedWorkflowActionRatingComponent extends AdvancedWorkflowActio
     return workflowAction ? (workflowAction.advancedInfo[0] as RatingAdvancedWorkflowInfo) : null;
   }
 
+  /**
+   * Returns whether the field is valid or not.
+   *
+   * @param formControlName The input field
+   */
+  isInvalid(formControlName: string): boolean {
+    return this.ratingForm.get(formControlName).touched && !this.ratingForm.get(formControlName).valid;
+  }
+
 }
diff --git a/src/assets/i18n/en.json5 b/src/assets/i18n/en.json5
index dea0ca7ed9..c56aa7d92b 100644
--- a/src/assets/i18n/en.json5
+++ b/src/assets/i18n/en.json5
@@ -541,6 +541,8 @@
 
   "advanced-workflow-action.rating.form.rating.label": "Rating",
 
+  "advanced-workflow-action.rating.form.rating.error": "You must rate the item",
+
   "advanced-workflow-action.rating.form.review.label": "Review",
 
   "advanced-workflow-action.rating.form.review.error": "You must enter a review to submit this rating",