Thanks for posting to the Community, @ybw2020.

Reversing an invoice payment will cause the account out of balance. Please make sure that you posted a reversal for the transaction. It will cancel the effect of the original transaction and ensures your accounts are accurate.

In QuickBooks Online, instead of removing the transaction, you can record a reversing entry to void a transaction in another period. You can restore the transaction without any problems since it's still on record.

First, you can void the transaction using a journal entry.

1. Open the transaction you want to void.
2. Select More, then select Transaction journal from the pop-up menu.
3. Keep selecting the Print (printer) icon until you get to the Print page.
4. Select Print. This will serve as your reference.
5. Select + New.
6. Select Journal Entry.
7. In the Journal date field, enter the date you want to show the transaction as reversed.
8. Enter the accounts in reverse based on the printed transaction journal. Example: If the transaction you want to void is a bill payment, debit the bank account then credit accounts payable.
9. Select Save, then close the window. The transaction is now voided.

For the second step, clear the transaction on the register. You can refer to this article: Void a transaction in another period.

You can also consult your accountant for help.

Please feel free to leave a comment if you need further assistance. I'll be around to help. Have a good one!