Yes, undoing the transactions from the reconciliation page affects your beginning balance, schall. Allow me to assist you further so you can smoothly reconcile your transactions.
One of the possible reasons why your reconciliation is off is due to transactions that are mistakenly added. With this, we'll have to compare your bank statement to what was recorded in QuickBooks Online (QBO) so we can verify if those transactions are correctly dated. If there are transactions that aren't supposed to be reconciled, we can undo these entries by following the steps below:
- Go to the Gear icon and select the Chart of Accounts.
- Locate the bank account you're currently reconciling, then click View Register.
- Look for the transactions and check if you can see R in the column.
- Select the transaction and repeatedly click the R status until it's blank or unreconciled.
- Click Save.
On the other hand, if the transactions are correctly entered, the opening or beginning balance might've entered incorrectly. To fix this, check out this: Enter and manage opening balances in QuickBooks Online.
Still, I'd suggest checking with your accountant for proper ways of handling this to maintain your books' accuracy.
Moreover, you can visit the article below should you encounter issues after reconciling your transactions: Fix issues at the end of a reconciliation in QuickBooks Online.
Please don't hesitate to comment below if you have other reconciliation-related concerns. The Community is always here to help at any time. Stay safe.