Yes, you can process requests for receipts issued in a previous fiscal year.
If your customers receipt was stamped by customs within 3 months after the month of purchase, they are allowed to submit the receipt for a VAT refund until up to 5 years after the year of purchase.
Our invoice for your customers VAT refund will be issued in your current book year. This way you can still help your customer get a VAT refund for an old purchase.