Missing values in tooltip page

Hello all

My report has a simple pie chart that shows sales by channel on a specific date filtered, let's say, from Jan 1st till Feb 1st. Now, i would like to see the sales from all this year, an last year for that channel. My question is, how can i avoid that date filter from the report which has the pie chart, because i believe this is the problem because i can't see the sales for last year.

Thanks a lot for all your help

Pedro