Changing the invoice a customer QBO payment was applied to

There's no specific update on the feature of editing and changing where to assign the customer payment, knrsmom.I'll help you resolve this so you can continue with the said task in QuickBooks Online (QBO).

The error you encountered happens when you try to edit a payment that has already been included in the bank deposit. To resolve this, we need to open the deposit and remove the payment from it.

Please refer to these steps to proceed:

1. Click the Gear icon.
2. Select Chart of accounts.
3. Locate the register holding the deposit.
4. Open the transaction and uncheck the invoice payment.
5. Hit Save and close.

Once done, let's navigate to the Sales menu to unlink the payment from the invoice. Here's how:

1. Go to the Sales menu and select Invoices.
2. Choose the invoice to access the Invoice activity page.
3. From the Paid section, click View payment.
4. Take note of the payment and uncheck the linked invoice.
5. Enter the payment value in the Amount received field.
6. Once done, hit Save and close, then choose Save as credit.

After this, let's apply the saved credit to the correct invoice for that customer:

1. Go to the + New icon and select Receive payment.
2. Select the Customer and pick the invoices associated with the payment.
3. Scroll down to the Credits section and apply the credit.
4. Once done, Save and close.

Finally, there are scenarios when you need to refund a customer if they've paid more than what they owe you. When this happens, you may refer to this link to help you handle this situation: Void or refund customer payments in QuickBooks Online.

If you have follow-up questions about your customer payments or invoices, kindly reply to this thread. I'm always happy to lend a hand.