Servoy JasperReports Plugin

When i create a report based on a foundset, i can't create a subreport based on a query directly on my database.....the subreport band is white....
I have not understood if this is a limit of the plugin, an error of the plugin, my error (probably) or something other....if in the same report i change the foundset with a query on the database the subreport appears....

I need to know if it is my error, or if this a not available option so i find other solutions.....

Thanks