Hi there, @MLom. I appreciate you taking the time sharing these details and I understand you need to reallocate income on those posted invoices.
In QBO, Once an invoice is posted with Product/Service items, the income account is locked at the item level and cannot be changed using the Reclassify Transactions tool or batch updates. The tool can only modify classes on these transactions, not the accounts themselves.
And you're right. Journal entries aren't recommended for this situation, as they can affect your Accounts Receivable aging and customer balance reports.
However, we have a workaround for this. You can edit the Product/Service item to map to the correct income account going forward or you can manually edit each invoice if it's still within the edit window and not linked to payments.
You can also use Classes to categorize and filter reports if you need to separate income without changing your account. But before doing so, ensure to turn on Classes feature in your Account and settings. For tips on how to manage the Class feature, feel free to read through this article: Create and manage classes in QuickBooks Online.
Let us know if you have further concerns.
