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
implements
			IStructure
{
	/**
	 * Display name for the property.
	 */
	private String displayName = null;
	/**
	 * Name of the type member.
	 */
	public static final String TYPE_MEMBER = "type"; 
	/**
	 * Name of the name member.
	 */
	public static final String NAME_MEMBER = "name"; 
	/**
	 * Name of the display name member.
	 */