Bug 142928 Item from library is changed to a report design item after revert to report item
Details: Item from library is changed to a report design item after revert to report item. Setp: 1.New a template. 2.Use a libary contain a label. 3.Drop the label from library explorer into layout. 4.Change the label to template item. 5.Revert the template item to report item. Actual result: The label is become a report item, but a item from library. Please see the attach image. Exception result: The lable is revert a item from library.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
* 
	 * @param propName
	 *            the name of the property of interest
	 * @return the value of the property. The type of the returned object
	 *         depends on the property type.
	 * @see #getIntProperty
	 * @see #getStringProperty
	 * @see #getFloatProperty
	 * @see #getNumberProperty
	 */
	public Object getProperty( String propName )
	{
		
		DesignElement element = getElement( );
		Object value = element.getProperty( module, propName );
		if ( value instanceof ReferenceValue )
			return ReferenceValueUtil.needTheNamespacePrefix(
					(ReferenceValue) value, getModule( ) );
		PropertyDefn defn = (PropertyDefn) getPropertyDefn( propName );
		if ( value instanceof List && defn != null
				&& defn.getSubTypeCode( ) == PropertyType.LIST_TYPE )
		{
			List valueList = (List) value;
			List names = new ArrayList( );
			for ( int i = 0; i < valueList.size( ); i++ )
			{
				ElementRefValue item = (ElementRefValue) valueList.get( i );
				names.add( ReferenceValueUtil.needTheNamespacePrefix( item,
						getModule( ) ) );
			}