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 module
	 *            the module
	 * @param prop
	 *            definition of the property to get
	 * 
	 * @return value of the property.
	 */
	public Object getProperty( Module module, PropertyDefn prop )
	{
		return getLocalProperty( module, prop );
	}
	/**
	 * Sets the value for the given property definition.
	 * 
	 * @param prop
	 *            definition of the property to set
	 * @param value
	 *            value to set
	 */
	public void setProperty( PropertyDefn prop, Object value )
	{
		assert prop != null;
		String memberName = prop.getName( );
		if ( memberName.equals( TYPE_MEMBER ) )
		{
			type = MetaDataDictionary.getInstance( ).getPropertyType(
					(String) value );
		}
		else if ( memberName.equals( NAME_MEMBER ) )