We have a process of SEZ sales to a customer. We have our billing location in Bangalore and our customer's unit is located in an SEZ Technology park. However we also have the same customer also in Bangalore with a different GST No but under an STPI. In case of SEZ sales IGST should be charged and for STPI sales CGST and SGST should be charged. We also need to track the invoices where sales are made to SEZ with a documentary evidence to claim the refund of tax since SEZ Sales is a deemed export sale.
The question is how do we track the sale with different taxes between the same buyer and supplier? I suggested to create different customers but our business user is not ready. Also how to track the documentary letter for GST refund in the system against an invoice for SEZ sales? Please guide.