// read and validate raw model
        Model fileModel = readFileModel(request, problems);
        result.setFileModel(fileModel);

        Model activatedFileModel = activateFileModel(fileModel, request, result, problems);
        result.setActivatedFileModel(activatedFileModel);

        if (!request.isTwoPhaseBuilding()) {
            return build(request, result, importIds);

        activateFileModel(request, result, problems);

        if (!request.isTwoPhaseBuilding()) {
            return build(request, result, importIds);
        } else if (hasModelErrors(problems)) {
            throw problems.newModelBuildingException();
        }

        return result;
    }

    private void activateFileModel(
            final ModelBuildingRequest request,