Royal Netherlands Embassy - Accra, Ghana

Please my name is Bismarck, on what condition can one be refused of his visa if he has gotten the invitation to under take a short course in Lithuania,he has paid all the fees for the course and provided all the needed documents to support his visa application. Please kind you kindly answer me?

Dear Sir/ Madam,
Please how can I qualified for a sponsorship to attend an International training workshop organized by U.S Census Bureau this year?