Hi there, HennaK. 

Sharing your thoughts in this thread regarding the wrong date entered in the reconciliation is greatly appreciated.

I would suggest providing your suggestions to let the system detect the error (date) directly to our engineers. That way, users will no longer undo the previous reconciliation. They actively consider customer ideas when planning future updates and enhancements to QuickBooks.

Here's how:

1. Go to the Gear icon at the top.
2. Select Feedback.
3. Enter your comments or product suggestions. Then select Next to submit feedback.

In addition, check these links to guide you further on fixing issues when reconciling an account in QBO:

• Fix issues for accounts you've reconciled in the past in QuickBooks Online.
• Fix issues at the end of a reconciliation in QuickBooks Online.
• Edit an incorrect opening balance.

Keep me posted if you have other concerns aside from the reconciliation issue. I'll be glad to help.