diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java
index 47b5b9b7f..5096787ef 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/StretchesFunction.java
@@ -39,6 +39,10 @@ import org.joda.time.LocalDate;
  */
 public class StretchesFunction extends AssignmentFunction {
 
+    public enum Type {
+        DEFAULT;
+    }
+
     public static class Interval {
 
         private LocalDate start;
@@ -151,6 +155,9 @@ public class StretchesFunction extends AssignmentFunction {
 
     private List<Stretch> stretches = new ArrayList<Stretch>();
 
+    private Type type;
+
+
     public void setStretches(List<Stretch> stretches) {
         this.stretches = stretches;
     }
@@ -170,6 +177,10 @@ public class StretchesFunction extends AssignmentFunction {
         return Collections.unmodifiableList(stretches);
     }
 
+    public Type getType() {
+        return type == null ? Type.DEFAULT : type;
+    }
+
     public void addStretch(Stretch stretch) {
         stretches.add(stretch);
     }
diff --git a/navalplanner-business/src/main/resources/org/navalplanner/business/planner/entities/ResourceAllocations.hbm.xml b/navalplanner-business/src/main/resources/org/navalplanner/business/planner/entities/ResourceAllocations.hbm.xml
index 77b46948e..688f2a359 100644
--- a/navalplanner-business/src/main/resources/org/navalplanner/business/planner/entities/ResourceAllocations.hbm.xml
+++ b/navalplanner-business/src/main/resources/org/navalplanner/business/planner/entities/ResourceAllocations.hbm.xml
@@ -111,8 +111,12 @@
                     <property name="amountWorkPercentage" not-null="true" />
                 </composite-element>
             </list>
+            <property name="type">
+		      <type name="org.hibernate.type.EnumType">
+		        <param name="enumClass">org.navalplanner.business.planner.entities.StretchesFunction$Type</param>
+		      </type>
+		    </property>
         </joined-subclass>
-
     </class>
 
     <class name="DerivedAllocation">