public BsUserCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    protected BsUserCA doGetConditionAggregation() {
        if (_conditionAggregation == null) {
            _conditionAggregation = createLocalCA();
        }
        return _conditionAggregation;
    }

    protected BsUserCA createLocalCA() {