UNAT agreed with UNRWA DT that the Agency is estopped from revisiting the determination of whether the injury was service-related, given that the Agency had made several representations to the staff member over a period of time, and which the staff member had relied upon. However, UNAT disagreed that granting reimbursement for medical expenses in Syria would automatically mean that the Agency would also pay for such expenses in Germany. Pursuant to Area Staff Rule 106.4(3), the staff member needed prior authorization before he could be reimbursed for the costs of medical treatment in hospitals...