Sorry, forgot to attach screenshot.

There is no such option but will check in future updates. Thank you

Thanks.

In the mean time, anybody looking for a solution, I have created a MySQL trigger to prevent deletion if there are any purchases of the product.

DELIMITER $$

CREATE TRIGGER AKA_Prevent_Delete 
BEFORE DELETE ON sma_products 
FOR EACH ROW 
BEGIN 
  IF OLD.id IN (SELECT `sma_purchase_items`.`product_id` FROM `sma_purchase_items` WHERE `sma_purchase_items`.`product_id` = OLD.id) THEN 
    SIGNAL SQLSTATE '45000' 
    SET MESSAGE_TEXT = 'Cannot delete purchased product. Delete purchase first.'; 
  END IF; 
END 
$$

DELIMITER ;

PS: Review the code before using.