Thank you for reaching out to us on this and the screen shot.
Can I get you to check the opening and closing balance entered for this reconciliation in your QuickBooks file with your bank statement, please?
Here is an article from our online community might be useful for you:
How to resolve reconciliation differences
We want to make sure your reconciliation report is accurate, a1b2.
Yes, you are correct that an accountant can undo the previous reconciliation. Sometimes, it is the best option to correct the reports.
I've got this article with the steps on how your accountant can undo a reconciliation in QuickBooks Online. Once done, you can reconcile the account again.
I'll be here if you need more help with QuickBooks reconciliation. Thanks.
I have some information regarding the greyed out Cleared Date.
The Cleared Date is greyed out since the date depends on when the transaction was cleared from the bank.
I take it that you have your credit card connected in QuickBooks. We're unable to edit the Cleared Date column (it remains greyed out for online banking transactions).
However if you simply need to edit the date of the transaction, you can do so by changing it under the DATE column. Click Save to apply the changes.
If you need a guide or a reference on reconciliation, you can check this article: Reconcile an account in QuickBooks Online.
Give other articles a shot if you need help with other tasks. They can help you manage your transactions, run reports, or manage your customers and vendors.
Do let me know if you have other tasks you need to accomplish in QuickBooks Online. I've got you covered with your needs.