Case in multiselect optional PROMPT (if value is null then..)

[hana00]

Hi all!

I have some problem with adding case to filter using prompt, maybe somebody had same issue like mine, I looked a lot in internet but all fixes didn't worked..

I have multiselect and optional prompts and I would like to create in filter on query, which will have logics like this:

when ?Prompt 1? is null  then  [Data Item] in ?Prompt 2?
when ?Prompt 2? is null then do nothing

Something like this.

Thanks for help in advance!