Modifying Payment Screen Numpad in POS
I'm using the POS module from Odoo Community v9. In the payment screen, the numpad has pre-programmed buttons for 10, 20 and 50. To better reflect local currency, it would be more appropriate to change the buttons to 100, 500 and 1000. I have done this by modifying directly the relevant lines in pos.xml file. However, when Odoo updates the pos.xml file in the future, these changes will be gone.
Is there perhaps a better way of doing this or preventing future updates from reverting to the changes I have made?