In BUSY, you can post sales return invoice against exported items by follow these steps:
Step 1: Go to transaction then click on sales return.
Step 2: Click on add then mention the invoice number, date, select export sales type, party name, material center in header part of invoice.
Step 3: Now, Mention the item details with quantity and update price then apply tax.
Step 4: While save the voucher, original sales details window will display. Update original sales invoice details in it and then save it