Error: "Sage Sales Tax Processing Failed - Invoice deleted" when creating a sales invoice and using SST

As of V12P28, Sage Sales Tax requires an Entity/Use Code on any customer that is to be exempt taxes due to being a reseller. When there is an exemption code on the customer setup, even if there is an Entity/Use Code you will receive this error for some states.

CAUTION: Use caution when working with the below product functionality. Always create a backup of your data before proceeding with advanced solutions. If necessary, seek the assistance of a qualified Sage business partner, network administrator, or Sage customer support analyst.
CAUTION: Sage support can't assist with third-party products, hardware, report customizations, or state and federal tax questions. Refer to our Scope of Support for more info. Contact your Sage business partner, network administrator, or accountant for assistance.

Remove the exemption code on the Customer and verify that there is a valid Entity/Use code.

1. Go to Common data, BPs and Customers.
2. On the Financials tab, find the Exemption no. field and clear the exemption code
3. Go to Ship-to customer heading and enter an Entity/Use code. (G is the current code for resellers as of V12P28)