I invoiced a customer we sold to. but while running the 'Sales by customer detail' report, it is added to and appears under a different customer. How can I rectify this?

Hello there, precious2.

I'm here to guide you on how to rectify an invoice in QuickBooks Online (QBO). This way, you'll be able to provide the correct information in the transaction and keep your sales accurate.

Through the Sales by Customer Detail report, you'll have to select the invoice to open its content. Then, update the customer name to the correct one from there. This way, the transaction will automatically be transferred to the one you sold the item to. 

1. Go to the Reports menu.
2. Type in Sales in the search bar, then select Sales by Customer Detail.
3. Locate the name of the different customer, then click the invoice.
4. From there, select the correct customer from the Customer drop-down field.
5. Click Save and close.

On the other hand, in case you already record a payment to the invoice, you can still make the necessary edits. However, you'll have to delete the unapplied payment that's credited to the incorrect customer. Then, process a payment to the correct one.

1. Go to the Sales menu.
2. Select Customers.
3. Click the name of the different customer.
4. Locate and select the Unapplied Payment.
5. Select More.
6. Choose Delete.
7. Click Yes to confirm.

Once done, you can now process a payment to the correct customer's invoice. For the detailed steps, kindly refer to this article: Record invoice payments in QuickBooks Online. It also contains information about recording partial and joint payments.

Moreover, you can go back to the Reports menu to pull up the Sales by Customer Detail report again. This is to verify the updates you made. Then you can customise it to focus on the details that matter most. You can check out this article for the complete information: Customise reports in QuickBooks Online.

Please let me know if you have other concerns. I'm just around to help.