Why is tax showing on transactions that have the exemption no. populated?

Overview

Through the API our integration is sending values in the exemption no. field within our gettax calls yet there is still tax showing on our transactions.

Environment

Avalara Avatax

Resolution

• This will happen if your ECMS is set to Required. 
• You will need to have an account admin change the setting from Required to Optional, allowing either an ECMS record or the exemption no. field to interchangeably exempt your customers.