What this is
Customer due grows when a sale uses Due (or an opening Due on the customer).
Open Dues to see:
- outstanding amount
- how many open invoices make up the balance
- oldest open invoice age
- last payment date
Then use Collect to enter how much the customer paid today, choose the payment type, and review where aPOS will apply it (oldest invoices first). Use Payment history on the row menu to review past collections.
An open balance is not automatically an error — cafés and shops often leave trusted bills open on purpose.
aPOSAlerts can flag a bank transfer; you still confirm collection here.