A monthly report is simply an addition of all the Z Reports you've made during the month. You cannot do a monthly report directly in the cash register, this must be done in Backoffice.
Log in and click Reports in the top menu.
Choose Your Reports.
Choose Z Report in the left menu.
Now choose a custom period, then start and end dates. You can also choose daily, weekly and monthly, which will allow you to make schedules deliveries of reports.
The system will summarize the months Z Reports into one large monthly report. You may now e-mail it, print it, or download an SIE file if you have configured a chart of accounts.