In the case of a SEPA B2B Direct Debit, your debtors must always sign a new mandate and send it to you. They must also register this mandate with their own bank using a registration form.
To make things easier for your debtors, you can send both the mandate and the registration form to your debtor. He can then sign and return the mandate and registration form to you at the same time. You keep the mandate in your own records and forward the registration form to your debtor's bank (see instructions on the form).
You can only use the registration form of the joint Dutch banks. You can find this form below.