Overdue amount field prints as CR instead of DR on the customer statement. For example the total for the field Amount overdue adds the aging from 120 + 90+ 60+ 30 for statement as below which gives you a R1 430DR. However, the amount prints as R1 430CR which looks as if you owe the customer.
The issue is known and has been logged as PPAS-388 for investigation.
Unfortunately, the workaround is to not use the field.