Imprimir facturas

Buenas tardes, estoy teniendo problemas para imprimir mas de una factura a la vez. Tengo instalado el modulo account_invoice_ar. Alguien en la comunidad hizo alguna modificación que permita lograr esto?

The invoice report is setup such that it can render only one invoice at a time. This is because for legal reason we have to store it for each posted invoice.
But when you request to print many invoices at once, the server is putting each invoice into a single zip file that you can open. If your are using the desktop client, you can even request to directly print the and the client will automatically open the zip file and send to the printer each invoice inside. (This is not possible to implement this behavior in the web client)