Bug 168808 Display text is lost after launching import values dialog
Steps to reproduce: 1.new a parameter; 2.select list box control type; 3.press "Import Values" button to import some values; 4.assign display texts for the imported values; 5.press "Import Values" button to launch import values dialog again; 6.press ok button on dialog; Expected result: The previous assigned display texts are remained. Actual result: The previous display texts are lost.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
else
		{
			canBeNull = inputParameter.allowNull( );
		}
		return canBeNull;
	}
	private boolean isDefaultChoice( SelectionChoice choice )
	{
		String choiceValue = choice.getValue( );
		String defaultValue = convertToStandardFormat( this.defaultValue );
		if ( canBeNull( ) && choiceValue == null && defaultValue == null )
		{
			return true;
		}
		return choiceValue != null && isEqual( choiceValue, defaultValue );
	}
	private boolean isStatic( )
	{
		return staticRadio.getSelection( );
	}
	private String convertToStandardFormat( String string )
	{
		if ( string != null
				&& DesignChoiceConstants.PARAM_TYPE_DATETIME.equals( getSelectedDataType( ) ) )
		{
			try
			{
				string = convertToStandardFormat( DataTypeUtil.toDate( string,
						ULocale.US ) );
			}