Schengen visa for Netherland refused, how to do appeal?

[QIN]

 Hello, I am a university student, just applyed Schengen visa for Netherland due to join a trip which organised by my University Student Union,but refused ,in the refusal enclosure mentioned: "the justification for the purpose and conditions of the inended stay was not reliable",but the information of documents which i submitted all are true and reliable,so at this case, how can i write a visa appeal??  Thank you in advance!!!

[steven]

They are not saying that the documents that you presented were unreliable. They say that "the justification ... was not reliable". You probably did not provide enough documents or documents that would clearly explain the purpose of your trip. What you have to do now is to get more of official documentation from your university saying what exactly you will be doing there and where you stay, and submit the appeal. The documentation can include accomodation reservations, reservations of visits, itinerary, trip programme, etc.