The CBI has registered a case against self-styled godman Daati Maharaj on charges of raping and having unnatural sex with an inmate of his ashram, the agency said on Friday.Daati Maharaj alias Dati Madan Lal Rajasthani has been named in a CBI FIR along with three associates Ashok, Arjun and Anil --- all known by their first names -- of raping and having unnatural sex with a 25-year-old disciple at his Ashram in Fatehpur Beri in south Delhi on January 9, 2016.Delhi Police had in June registered the case following a complaint from the Delhi-based victim.The CBI took over the investigation and filed the case on Thursday following a Delhi High Court order.