Until when can I (partially) revoke a debit order?

You can (partially) revoke a debit order with a deferred payment date in Central Fee Payment up to one day before the date you specified as the execution date. You will still be able to revoke it on the specified execution date but you then need to follow the procedure under point 13.1 ADA (see How can I (partially revoke a debit order?). Please note that debit orders without a deferred payment date can only be revoked on the date of their receipt (please see point 13.1 ADA)