diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java
index 99273d252..680e0b80d 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java
@@ -659,6 +659,7 @@ public abstract class OrderElement extends BaseEntity implements
         return schedulingStateType;
     }
 
+    @Valid
     public TaskSource getTaskSource() {
         return taskSource;
     }
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/TaskSource.java b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/TaskSource.java
index aee15a8aa..c19653f1b 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/TaskSource.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/TaskSource.java
@@ -26,6 +26,7 @@ import java.util.Set;
 
 import org.apache.commons.lang.Validate;
 import org.hibernate.validator.NotNull;
+import org.hibernate.validator.Valid;
 import org.navalplanner.business.common.BaseEntity;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.orders.entities.SchedulingState.Type;
@@ -282,6 +283,7 @@ public class TaskSource extends BaseEntity {
         this.orderElement = orderElement;
     }
 
+    @Valid
     public TaskElement getTask() {
         return task;
     }