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 a2a3d14f8..eb2432726 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
@@ -136,4 +136,9 @@ public abstract class OrderElement {
     public boolean isScheduled() {
         return !taskElements.isEmpty();
     }
+
+    public boolean checkAtLeastOneHoursGroup() {
+        return (getHoursGroups().size() > 0);
+    }
+
 }
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderElementController.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderElementController.java
index ac91623fc..56796310c 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderElementController.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/orders/OrderElementController.java
@@ -236,6 +236,12 @@ public class OrderElementController extends GenericForwardComposer {
      * managed by "save-when" at .zul file.
      */
     public void back() {
+        if (!getOrderElement().checkAtLeastOneHoursGroup()) {
+            throw new WrongValueException(window
+                    .getFellow("hoursGroupsListbox"),
+                    "At least one HoursGroup is needed");
+        }
+
         window.setVisible(false);
         Util.reloadBindings(window.getParent());
     }