'Print Screen' report won't print grouped tree view.

I really love the print screen report that has been recently added to the openerp7 version of Aeroo reports. I'd like to use it to print out the results of the tree view under 'Reporting' -> 'Point of Sale' -> 'Orders Analysis'.

Unfortunately, the 'Print Screen' report isn't compatible with this tree view, apparently since it uses grouping instead of actually query lines? Not sure where the problem lies, but it'd be great to have this fixed. Thanks!