# `PUT /unit`

Protected. Requires a valid session cookie (`credentials: 'include'`).

Upsert unit

Insert or update unit by `si` for the selected company. Upserts `unittext` for the company language.
`basesifactor` must be finite and `> 0`.


## Body (JSON)

```json
{
  "si": "l",
  "basesi": "l",
  "basesifactor": 1,
  "symbol": "L",
  "name": "Liter"
}
```

## Response `200`

Upserted unit

```json
{
  "unit": { … }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Invalid unit or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Company not found — `{"error":"…"}` |

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