You have bought a product with subscription and installment payments and selected bank transfer as the payment method and would like to create a standing order for it.
Since the payments are only automatically assigned with the correct purpose and each payment has a custom purpose, payment by standing order is not possible.
Please initiate a new payment via your payment manage page at least 3 banking days before your payment is due. There you will then receive the new purpose.
I have already set up a standing order and the payment was not allocated
Then please delete your standing order and send us your proof of payment as described here -> Transfer was made with the wrong purpose