I go to Accounting > Customer Payments and click create. I enter the customer name. I see a list of the customer's invoices and refunds. I select an invoice or refund and then click to fill the Reconcile check box. Sometimes it sticks, sometimes it disappears immediately. There seems to be a rule that allows/disallows the checkmark. What is it?
Also, sometimes, it seems like a refund will get it's reconcile box checked on it's own even though I never selected that refund. There again, it seems like there are rules in effect that auto-check a refund. If these rules existe, where are they listed?
Can you always replicate the behaviour? Or does this problem appear when you do specific steps? For example, i could only reproduce the problem when I chose to remove some lines. I tried again, this time without removing nothing, and the problem was not encountered.