Bug 119550 Default Value of Named Expression can't be saved in design file
New a report, set named expression in the report property editor add a named expression and set the default value add a report item, say table, to the layout set the named expression of the report item add a named expression and set hte default value save the report close the report and reopen, and there is no default named expression value displayed. open report design file with a text editor, there is no default value associate with the named expression
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/core/UserPropertyDefn.java
public static final String DISPLAY_NAME_MEMBER = "displayName"; 
	/**
	 * Name of the display name ID member.
	 */
	public static final String DISPLAY_NAME_ID_MEMBER = "displayNameID"; 
	/**
	 * Name of the structure itself. This is the name used to identify the
	 * structure in the meta-data dictionary.
	 */
	public static final String STRUCTURE_NAME = "UserProperty"; 
	/**
	 * Name of the choices member.
	 */
	public static final String CHOICES_MEMBER = "choices"; 
	/**
	 * All the allowed types of UserProeprtyDefn. Now, "extends", elementRef,
	 * structRef, structure are not supported.
	 */
	private static List allowedTypes = null;
	/**
	 * Default constructor.
	 */
	public UserPropertyDefn( )
	{
		PropertyType typeDefn = MetaDataDictionary.getInstance( )
				.getPropertyType( PropertyType.STRING_TYPE_NAME );
		setType( typeDefn );
	}
	/**
	 * Gets valid types for user property. Each one in the list is an instance