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
* 
	 * @param typeDefn
	 *            the property type
	 */
	public void setType( PropertyType typeDefn )
	{
		type = typeDefn;
	}
	/**
	 * Checks whether the element can take the given user property definition
	 * and the definition is valid.
	 * 
	 * @param module
	 *            the module
	 * @param element
	 *            the design element that holds the user-defined property
	 * 
	 * @throws UserPropertyException
	 *             if the element is not allowed to have user property or the
	 *             user property definition is invalid.
	 * @throws MetaDataException
	 *             if the user property definition is inconsistent.
	 */
	public void checkUserPropertyDefn( Module module, DesignElement element )
			throws UserPropertyException, MetaDataException
	{
		
		String name = getName( );
		if ( !element.getDefn( ).allowsUserProperties( ) )
			throw new UserPropertyException( element, name,