I have nephew came here under buseness visit visa,he produces only letter from his relatives proves that he has relatives in Doha, with relative passport copy,visa copy id copy and relatives employment contract.and, with another file is the sponsor letter, visa application, printed visa from the moi website.that all.at his first check-in denied and off-loaded and went home hopeless.We rebooked and finally boarded the plane without any problem or interview.