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
UserPropertyException.DESIGN_EXCEPTION_USER_PROP_DISALLOWED );
		
		if ( StringUtil.isBlank( name ) )
			throw new UserPropertyException( element, name,
					UserPropertyException.DESIGN_EXCEPTION_NAME_REQUIRED );
		if ( element.getPropertyDefn( name ) != null )
			throw new UserPropertyException( element, name,
					UserPropertyException.DESIGN_EXCEPTION_DUPLICATE_NAME );
		
		
		MetaDataDictionary dd = MetaDataDictionary.getInstance( );
		if ( dd.getPropertyType( getTypeCode( ) ) == null
				|| getTypeCode( ) == PropertyType.ELEMENT_REF_TYPE
				|| getTypeCode( ) == PropertyType.STRUCT_TYPE )
			throw new UserPropertyException( element, name,
					UserPropertyException.DESIGN_EXCEPTION_INVALID_TYPE );
		
		
		if ( getTypeCode( ) == PropertyType.CHOICE_TYPE )
		{
			IChoiceSet choices = getChoices( );
			if ( choices == null || choices.getChoices( ).length == 0 )
				throw new UserPropertyException( element, name,
						UserPropertyException.DESIGN_EXCEPTION_MISSING_CHOICES );
		}
		
		
		
		if ( hasChoices( ) )
		{