Why is the Avatax tax code field missing when importing items into Netsuite?

Overview

When importing into Netsuite the Avatax Tax Code isn't a field you can assign

Environment

Netsuite Basic & Oneworld

Resolution

• In Netsuite
• Customization > Form > Entry Forms
• Select the appropriate entry from the list and click the edit hyperlink
  • If you are importing Inventory items Edit Custom Inventory Part Form
    • The name can change based on the form you're using or any customizations
• Click on the Fields tab -> Custom tab
• Find the AvaTax Taxcode field on the list
• Click the "show" box for the field
• Save the record