When you try to close a ticket and there are required order tags that haven’t been selected, you get a message saying so.
However, if you click on “Payment” instead, the message doesn’t appear and you can’t go to payment screen - it just does nothing.
Same goes for any buttons like in my example “Exact Cash” and “Card” that will trigger a payment, they also do nothing when clicked.
I think the “required selection” message should appear in all these situations.