QuickBooks Connector Error - "AddInvoice: Invalid Reference Id : Categories cannot be used in transactions."

ERROR MESSAGE

"AddInvoice: Invalid Reference Id: Categories cannot be used in transactions."

WHAT CAUSES THIS ERROR?

Your invoice's line items (within Bill4Time) have an Activity Type selected that matches a Category in your Products and Services List within QuickBooks. QuickBooks does not allow for Category items to be mapped to invoices.

HOW DO I RESOLVE THIS ERROR?

There are a few different options to resolve this, based on your own needs/preferences. Please continue reading below for more information.

Option #1:
Update your Categories list within QuickBooks, to prevent them from matching/duplicating your Activity Types in Bill4Time.

1. Log into your QuickBooks Online Account.
2. Go to the Sales menu, then select Products and Services.
3. Select the dropdown More ▼, then Manage categories.
4. Select Edit from the Action column.
5. Make the changes you want and select Save. Or select Remove, then click OK.
6. Close/re-run the QuickBooks connector.

Option #2:
Update your Activity Types in Bill4Time, to prevent them from matching/duplicating your Categories in QuickBooks.

1. First, please reference this article for instructions on editing your Activity Types: 
   Can I customize the Activity and Expense lists when adding time/expenses?
2. Once you've edited your Activity Type list, you will need to locate/open the invoice(s) that was causing this error (you can find this invoice number within the QuickBooks Connector where the error is being displayed).
3. Click on each line item, click "Edit", and change the Activity Type dropdown to the new Activity you've created. (Note: If the invoice is Finalized you will need to Unfinalize first before you'll be able to edit the entries.)
4. Click "Save and Close" at the bottom of the time entry window.
5. Re-finalize the invoice and attempt re-exporting via the QuickBooks connector.

Option #3:
Edit your original time entries to remove the Activity Types you originally assigned.

1. Locate/Open the invoice(s) that's causing this error (you can find this invoice number within the QuickBooks Connector where the error is being displayed).
2. Click on each line item, click "Edit", and set the Activity Type dropdown back to "Select Activity". (Note: If the invoice is Finalized you will need to Unfinalize first before you'll be able to edit the entries.)
3. Click "Save and Close" at the bottom of the time entry window.
4. Re-finalize the invoice and attempt re-exporting via the QuickBooks connector.