Backorders quantities is not updating automatically

I think you are the only one in your organisation who cares, Steven as you are the only one who ever responds. So thank you.

1. "Transactions CAN'T be changed" is unticked. As it has been these past years.

2. Transaction was entered as 5-Mar-2021 payment date, and it's only gone into the bank account today, 9-Mar-2021. I like my accounts to be correct, so I just wanted to edit that. No EOFY, no BAS. no bank reconciliation in the meantime.

I have noticed since the last update, some message keeps coming up when I enter a supplier payment that some debit entry is being made, I have no idea what that means. I didn't change the setup. I have this overwhelming fatigue of unexpected software changes. I am in electronics, I am not a book keeper. I cannot afford a book keeper, but the requirements on small business owners are becoming too difficult for us to keep up with. Don't want to close my doors just because I can't hire a book keeper, it seems wrong.

With this latest issue, it will be related to the order I have done things in with this purchase order, which was:
1. Enter purchase order as an order.
2. Enter payment, as the supplier requires payment. This becomes a deposit in MYOB.
3. Goods arrive with a real invoice, so I change it to a bill. It's closed, because of the prepayment.
4. Checking the bank account, I see that the payment went through 4 days later, so I want to edit that one simple, easy, trivial detail. But no, it's all greyed out. No way to enter true, accurate, correct information.
5. Leave wrong information in the system, and move on.