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
IChoiceSet choiceSet = getChoices( );
			IChoice[] choices = choiceSet.getChoices( );
			for ( int i = 0; i < choices.length; i++ )
			{
				UserChoice choice = (UserChoice) choices[i];
				Object value = choice.getValue( );
				if ( StringUtil.isBlank( choice.getName( ) ) )
				{
					throw new UserPropertyException(
							element,
							name,
							UserPropertyException.DESIGN_EXCEPTION_CHOICE_NAME_REQUIRED );
				}
				if ( value == null )
					throw new UserPropertyException(
							element,
							name,
							UserPropertyException.DESIGN_EXCEPTION_CHOICE_VALUE_REQUIRED );
				if ( getTypeCode( ) != PropertyType.CHOICE_TYPE )
				{
					try
					{
						value = validateValue( module, value );
					}
					catch ( PropertyValueException e )
					{
						throw new UserPropertyException(
								element,
								name,
								UserPropertyException.DESIGN_EXCEPTION_INVALID_CHOICE_VALUE );