Filter charts with multiple master fields

[tabaki]

I am creating a report which should display for each state and for each month a different piechart of the diffrent events.

Now I am succeeding with the wizard to link just the state or just the month; but I can not do them both. When I do this the chart only looks at the last master/child link to filter on. Also when I am looking in the properties I find only the last link.

How can you make 2 master/child links in a chart?

 

[tabaki]

In the mean time I have found a solution myself... not a beautiful although. I've created a new field that is a combination of all the fields on which I want to filter. This field I use as master/child field.