I this video you can see I’m adding a couple of tickets to a customer account entity.
You can see the customer is a credit of 168.20 show account balance.
The total amount owed of tickets unpaid tickets = 27.40.
How do I when selecting a customer with unpaid tickets show the total amount of 27.40 (all combined open tickets for the customer) as a state under the customer credit / debit balance. So that when the customer places another order on there account the casher can see the total amount of unpaid tickets.