Hey Richard,
This happens when a Payment is either marked to be Reconciled or is Reconciled. It is GP's way of telling you have that you have a problem as you would not cash a check and void a check.
Most times when I see this is it because something was wrong on the check and the intention is to re-enter it. Re-entering creates a positive one in the bank rec that is used to offset the negative.
If this did not clear the bank, then you will need to look at doing an adjustment during the Reconciliation process. Alternatively, you can technically void that negative you are seeing in the Bank Rec as well.
I would suggest running through this in test and verify the Checkbook Balance and Cash Account are what showing what they should be to verify this keeps your balances correct.
I hope this helps!
Brandon
Microsoft Dynamics ERP and cloud partner | Enavate
