There is an invalid reference to QuickBooks InvoiceLineItem SalesTaxCode "..." in the Invoice line. QuickBooks error message: You can't set taxable if Sales tax is turned off or the item is not a taxable item type.
The tax setting in QuickBooks is set to not allow taxes.
- Turn on the QuickBooks preference setting to allow taxes
- Set Exempt as a default tax type so no taxes are calculated
- Verify the item being used is of a type that can be taxed