How cab I fix a wrong mashed pay transaction. I did slect the wrong. invoices.

I’ve got your back, colom.

Let me help you match the correct invoice for the payment synced into your QuickBooks Online (QBO).

We can match the payment to the correct invoice by reversing the reconciled account in your Chart of Accounts (COA).

There are two ways we can do that to rectify this matter. First, you can undo the reconciliation for the specific transaction you want to unmatch, however, every change made will cause the account unbalanced. Next, we can undo the entire reconciliation manually. This way, we can ensure and double-check every payment linked to a transaction and correct it if needed.

To undo a single transaction, you can follow the steps below:

1. Go to the Accounting menu and select Chart of Accounts.
2. Select the account you which these transactions are added to and click the Account history under the Action column.
3. Look for that specific transaction. If the transaction is reconciled, you’ll see an “R.”
4. Tick the box under the check column until it's blank. It removes the transaction from the reconciliation.
5. Then, click Save.
   

    

On the other hand, if you opt for undoing the entire reconciliation, you can follow the steps above to all the transactions.

Once done, unmatched the payment from an incorrect transaction. I’ll show you how:

1. Go to the Banking tab and then select the Categorised tab.
2. Find the transaction you want to unmatch.
3. Select the blue transaction link in the Added or Matched column to see the matched transaction.
4. Select Undo from the Action column.

The transaction you undo will go back to the For Review tab and the invoice you've matched to this payment will be reopened. 

You can also check this article on how to unmatch downloaded bank transactions or move them to another account. 

Moreover, you can re-reconcile your account to avoid any discrepancies: Reconcile an account in QuickBooks Online.

Let me know if you have more concerns with your bank transactions. I’ll be grateful to answer them. Have a good one!