QB Issue Resolution:

We can check to verify the income account used in the product/service item. You’ll want to make sure these accounts were link to the product/service item on your invoice.

You can then change the income account if needed. Doing this won’t affect the reconciled accounts, as long as you didn’t delete or change the reconciliation┬ástatus of the transaction.

To verify the account:

  1. Click Gear.
  2. Click Products and Services.
  3. In the Products and Services window, click the Gear icon beside the Export icon.
  4. Mark the Income account box.

Please see the added screenshot below.

Resolution for Issue 'Invoicing and only one income account?' available: Yes (Solved).
Source: Intuit Community forum.

Invoicing and only one income account?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Gear icon
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