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
{
			if ( value == null )
				name = null;
			else
				name = value.toString( );
		}
		else if ( memberName.equals( DISPLAY_NAME_MEMBER ) )
		{
			if ( value == null )
				displayName = null;
			else
				displayName = value.toString( );
		}
		else if ( memberName.equals( DISPLAY_NAME_ID_MEMBER ) )
		{
			if ( value == null )
				displayNameID = null;
			else
				displayNameID = value.toString( );
		}
	}
	/**
	 * Gets the name predefined for this structure.
	 * 
	 * @return structure name "UserProperty".
	 * 
	 */
	public String getStructName( )
	{
		return STRUCTURE_NAME;