If you refund a client money for a package (vouchers), the vouchers / package should automatically be removed from the clients account, too. By making this a 2-step process, it does not link the removal (or allow for tracking of why a voucher was voided) of the vouchers to a transaction and it lends itself to errors. If a staff member refunds a package but forgets to remove vouchers, a client could, hypothetically, still use the vouchers and technically receive a free treatment.