The Directive of the Rectorate "1.31. - Doctorant financé par des fonds externes" mentions at its article 1, subsections 2 and 3 :
"A doctoral student must hold a university diploma giving access to the University of Lausanne and to registration as a doctoral student within a faculty.
He/she has to be registered as a doctoral student no later than 12 months after the beginning of his/her contract. The Dean’s Office of the faculty informs the Human Ressources Department of the doctoral student’s formal registration for the thesis at the latest during the 13th month after the beginning of his/her contract."