# Device Batch Import Specification

## ADDED Requirements

### Requirement: Admin device import template includes optional sn after virtual_no

The admin device import template SHALL insert an optional `sn` column immediately after required `virtual_no`.

#### Scenario: Download the latest device import template

- **GIVEN** a platform user opens the "批量导入设备" dialog
- **WHEN** the user clicks "下载导入模板"
- **THEN** the downloaded template MUST include `virtual_no` as the first column
- **AND** the downloaded template MUST include `sn` as the second column
- **AND** `sn` MUST be optional

#### Scenario: Import dialog documents the new sn column

- **GIVEN** a platform user opens the "批量导入设备" dialog
- **WHEN** the import instructions are displayed
- **THEN** the page MUST indicate that `sn` is an optional column in the device import template
