(80)A derogation could also be justified where the costs of the procedure leading to a discharge of debt, including the fees of judicial and administrative authorities and of practitioners, are not covered. Member States should be able to provide that the benefits of that discharge can be revoked where, for example, the financial situation of the debtor improves significantly due to unexpected circumstances, such as winning a lottery, or coming in the possession of an inheritance or a donation. Member States should not be prevented from providing additional derogations in well-defined circumstances and when duly justified.