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
}
	/**
	 * Gets the property type.
	 * 
	 * @return integer represented user property type.
	 * 
	 */
	public int getValueType( )
	{
		return USER_PROPERTY;
	}
	/**
	 * Makes a copy of this user property definition.
	 * 
	 * @return IStructure of this property definition, or null if this property
	 *         definition can not be cloned.
	 */
	public IStructure copy( )
	{
		try
		{
			UserPropertyDefn uDefn = (UserPropertyDefn) clone( );
			if ( details instanceof ChoiceSet )
			{
				uDefn.details = ( (ChoiceSet) details ).clone( );
			}
			return uDefn;
		}
		catch ( CloneNotSupportedException e )
		{