Filtering multiple values

Hi all,

I've an issue with filtering multiple values of one dimension. I want to filter the dimension "customer_land". All works fine if I choose values like US, GB and DE. Additionally it can be possible that the customer_land is blank. If I want to add the blank value to this existing filter, nothing happens. There are still only 3 filter values (US, GB and DE).

I expect that a multiple filter with blank values is possible because a single filter on this blank criteria works!

Any ideas?

Regards,

Peter