There's no direct way to choose an effective date for voiding a check in QuickBooks Online (QBO), DaytonWhite. You're correct that you can use a reverse journal entry (JE) to void the transaction. Let me discuss this in detail below.
Based on your scenario, it seems that the books were already closed, which is why it prompts you for a password when making changes to previous transactions, specifically with checks.
To void the check in another period without deleting any of your records, consider recording a reversing entry. You can start by taking note of the check transaction journal for your reference. Here's how:
- Locate the check transaction and select it.
- Tap More, then choose Transaction journal from the pop-up menu.

- Select the Print (printer) icon to get to the Print page. This will serve as your reference.
Once done, proceed to generate a reversing JE to void the check:
- Select + New.
- Pick Journal Entry.
- In the Journal date field, enter the date you want to show the transaction as reversed.
- Enter the accounts in reverse based on the printed transaction journal.
- Select Save, then close the window. The transaction is now voided.
After that, you can clear the transaction on the register by following Step 2 of this article: Void a transaction from another period in QuickBooks Online.
Additionally, you can visit this article in case you want to learn more about setting up your print options in QBO so your checks align and print out correctly: Configure your print settings for printing checks in QuickBooks Online.
I’m here to help with any additional questions or concerns you may have about voiding checks or related matters. Please feel free to share your thoughts or inquiries below, and I will promptly provide you with the support you need.