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
* @see org.eclipse.birt.report.model.api.core.IStructure#isReferencable()
	 */
	public boolean isReferencable( )
	{
		return false;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#setDefault(java.lang.Object)
	 */
	public void setDefault( Object value )
	{
		super.setDefault( value );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.ElementPropertyDefn#build()
	 */
	public void build( ) throws MetaDataException
	{
		
		
		
		if ( isIntrinsic( ) && isStyleProperty( ) )
			throw new MetaDataException( new String[]{name},
					MetaDataException.DESIGN_EXCEPTION_INCONSISTENT_PROP_TYPE );
	}
}