Mustafa,
Looks like the exclusion option is available only in the Characteristic restriction section of QD and not in Default Values section of QD. This probably means that exclusion is not available at runtime and using filter selection and available only in design time.
There are also bunch of notes which suggests that exclusion is not an option in BEx Web 7.X and BEx Analyzer 7.X, if it is not available in those time I doubt this will be available for DS.
Deepu