Report showing discounts from invoices?

Report showing discounts from invoices?

I've gone through all of the reports in Zoho Invoice and searched the forums for possible answers, but have not found a way to see all of the discounts that I have issued clients.  Is there a way to see the discounts without going into every invoice and manually viewing each one individually?

Ideally, I would like to be able to generate a report similar to "sales by item/customer" that would show the discounts given on all invoices for a given date range could be grouped by either item or customer.

Jodi