=== modified file 'dhis-2/dhis-api/src/main/java/org/hisp/dhis/dataelement/DataElementCategoryCombo.java'
--- dhis-2/dhis-api/src/main/java/org/hisp/dhis/dataelement/DataElementCategoryCombo.java	2010-04-12 21:23:33 +0000
+++ dhis-2/dhis-api/src/main/java/org/hisp/dhis/dataelement/DataElementCategoryCombo.java	2010-05-12 12:21:00 +0000
@@ -27,12 +27,12 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
+import org.hisp.dhis.common.IdentifiableObject;
 import org.hisp.dhis.dimension.Dimension;
 import org.hisp.dhis.dimension.DimensionOptionElement;
 import org.hisp.dhis.dimension.DimensionSet;
@@ -43,7 +43,7 @@
  * @version $Id$
  */
 public class DataElementCategoryCombo
-    implements Serializable, DimensionSet
+    extends IdentifiableObject implements DimensionSet
 {
     public static final String DEFAULT_CATEGORY_COMBO_NAME = "default";
 

=== modified file 'dhis-2/dhis-api/src/main/java/org/hisp/dhis/period/Period.java'
--- dhis-2/dhis-api/src/main/java/org/hisp/dhis/period/Period.java	2010-05-05 17:48:34 +0000
+++ dhis-2/dhis-api/src/main/java/org/hisp/dhis/period/Period.java	2010-05-12 12:21:00 +0000
@@ -27,11 +27,11 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-import java.io.Serializable;
 import java.util.Date;
 import java.util.List;
 import java.util.Set;
 
+import org.hisp.dhis.common.IdentifiableObject;
 import org.hisp.dhis.dimension.Dimension;
 import org.hisp.dhis.dimension.DimensionOption;
 import org.hisp.dhis.dimension.DimensionOptionElement;
@@ -42,10 +42,8 @@
  * @version $Id: Period.java 5277 2008-05-27 15:48:42Z larshelg $
  */
 public class Period
-    implements Serializable, DimensionOption
+    extends IdentifiableObject implements DimensionOption
 {
-    private int id;
-
     /**
      * Required.
      */
@@ -61,11 +59,6 @@
      */
     private Date endDate;
     
-    /**
-     * Convenience property.
-     */
-    private transient String name;
-
     // -------------------------------------------------------------------------
     // Constructors
     // -------------------------------------------------------------------------
@@ -214,16 +207,6 @@
     // Getters and setters
     // -------------------------------------------------------------------------
 
-    public int getId()
-    {
-        return id;
-    }
-
-    public void setId( int id )
-    {
-        this.id = id;
-    }
-
     public void setEndDate( Date endDate )
     {
         this.endDate = endDate;
@@ -253,14 +236,4 @@
     {
         this.startDate = startDate;
     }
-
-    public String getName()
-    {
-        return name;
-    }
-
-    public void setName( String name )
-    {
-        this.name = name;
-    }
 }