Chart dataset parameter

Hi,

I have a problem with chart report. I have 4 datasets and created same parameter in each of the datasets. I select parameter in chart, Chart details -> Dataset run (selected my dataset) -> Parameters tab -> Add and then Dataset parameter name. I select the parameter I created in my dataset but value expression doesn't show fields from my dataset, instead it shows main query fields.

So question is how do I add parameter to chart which fills data from dataset?

Thanks!