St. Vincent Medical Center, one of the largest organ transplantation centers in the state, has suspended its liver program after discovering that its doctors improperly arranged for a transplant to a Saudi national using an organ that should have gone to a much higher priority patient at another hospital, officials said. Hospital staff members then falsified documents several times to cover up the alleged maneuver, pretending that the transplant was for a patient who was near the top of the regional waiting list, hospital President and Chief Executive Gus Valdespino confirmed Monday.