You cannot use the same tax item in both the line items and the txn tax.

Map another tax code to the bottom of the sale

Problem

In your log, you get this error:

Error 3140 : While trying to Add a(n) Invoice with order number of 241, QB responded There is an invalid reference to QuickBooks Item "Total AvaTax" in the Invoice line. QuickBooks error message: You cannot use the same tax item in both the line items and the txn tax.  

Description

 You are applying tax as a line item and as a QuickBooks tax code. Notice how Total AvaTax is a line item and tax code at the bottom of the sale.

Solution

Map a tax code for zero tax

Here are the steps:

1. In QuickBooks, go to edit > preferences > integrated applications.
2. Click sales tax.
3. Under most common item, enter out of state:
4. If the code is missing, either add it or use another tax code.

If you cannot edit the code, log into Connex. Click manage. Expand sales tax. Choose a default code: