Hello Swipe! I Need help with Error Message: For outward CKD/SKD/Lots supply type, Bill To state should be as Other Country, since the Bill To GSTIN given is of SEZ unit - /ewaybills/create

It seems like you are trying to create an E-way bill for the customer who is SEZ registered.
It is not possible to create E-way bill for those SEZ registered customer by creating an normal tax invoice.

We request you to please create an SEZ invoice to create an E-way bill for SEZ registered customer.

Please refer to the below article to create an SEZ invoice.
Please select SEZ with/without IGST payment as a export type to create an SEZ invoice.