If you mean to unmatch a reconciled transaction, reach out to your accountant for advice. This type of change can have a big impact on your accounts. Your accountant can help you unreconcile the transaction and make corrections.
On the other hand, you might want to run a reconciliation report for reference when you encounter issues while reviewing your account for the succeeding month.
You're always welcome to reply on this thread if you have any additional questions or other concerns about unmatching transactions in QuickBooks. We're available to help you out some more.
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