A lane (OT_BPMN_LANE with symbol ST_BPMN_LANE_1) must always be placed in a pool (OT_BPMN_POOL). Furthermore, an object of type Lane (OT_BPMN_LANE with a symbol ST_BPMN_LANE_1) must not be nested in another object of type Lane (OT_BPMN_LANE with a symbol ST_BPMN_LANE_1).