diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderElementTemplate.java b/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderElementTemplate.java
index b327a74f9..0faf00401 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderElementTemplate.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderElementTemplate.java
@@ -219,4 +219,6 @@ public abstract class OrderElementTemplate extends BaseEntity implements
         }
         return result;
     }
+
+    public abstract boolean isLeaf();
 }
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineGroupTemplate.java b/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineGroupTemplate.java
index ad58096ac..87b869e07 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineGroupTemplate.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineGroupTemplate.java
@@ -165,4 +165,9 @@ public class OrderLineGroupTemplate extends OrderElementTemplate implements
         return result;
     }
 
+    @Override
+    public boolean isLeaf() {
+        return false;
+    }
+
 }
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineTemplate.java b/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineTemplate.java
index 1adeb7273..ac38b3a68 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineTemplate.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/templates/entities/OrderLineTemplate.java
@@ -61,4 +61,9 @@ public class OrderLineTemplate extends OrderElementTemplate {
         return new ArrayList<OrderElementTemplate>();
     }
 
+    @Override
+    public boolean isLeaf() {
+        return true;
+    }
+
 }