Add module account_banking_sepa_direct_debit that implements pain.008.001.02, pain.008.001.03 and pain.008.001.04.
This module is not ready yet : the management of mandates is still missing. I am currently trying to get more information about these mandates to decide what is the best implemtation of the data model of the mandates (O2M on res.partner ? O2M os res.partner.bank ?).