Restore Initial Configuration

[debh]

Hi everyone!

Working on a data mining and machine learning project, I have wrongly saved a tranformation node in Exchange and I think that it has overwrited other functional nodes. For instance, I cannot find anymore the 'replacement node' option constructing the pipeline. I have tried also on a different project work, and it appears the same. Is it possible to restore the initial configuration? 

Thank you for answering me!