# Creates several units of measure in one call.

`POST /inventory/unit-of-measures/bulk`

Group: Inventory › Units of Measure · Operation ID: `bulkCreateUnitOfMeasures`

All or nothing. If any entry is rejected, nothing is written and the whole call fails. Use POST inventory/unit-of-measures to create a single unit of measure.

[Open in the interactive reference](https://docs.api.lensing.ai/?op=bulkCreateUnitOfMeasures)

## Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `Api-Version` | header | `"v1"` | yes | The API version this request targets, named by its public identifier. Required on every request; omitting it, or naming a version this company does not have, is answered with 400. This document describes version `v1`. |
| `Idempotency-Key` | header | string | no | An opaque caller-chosen string (1-255 characters) that makes this request safe to retry. Repeating the same key with an identical request body replays the original response instead of re-executing - but only once that original request succeeded; a failed attempt re-executes on retry. Repeating the key with a different body is answered with 422. A key still in flight is answered with 409 - as is a key whose original request was interrupted before it finished, for a few minutes afterwards, until that attempt is presumed dead. A completed response stays replayable for 24 hours. The key is scoped to the caller, not to the action: reusing it for a different action is answered with 409 or 422 rather than treated independently. On read actions this header is ignored. On write actions that cannot offer the guarantee it is answered with `400 IDEMPOTENCY_NOT_SUPPORTED` rather than silently ignored. |

## Request body

Required, `application/json`: bulkCreateUnitOfMeasuresInput.

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `unitOfMeasures` | array of object | yes | The units of measure to create. If any entry is invalid, nothing is written and the whole call fails. |
| `unitOfMeasures[].unitCode` | string | yes | The short code of the unit of measure, for example 'KG'. Required. It must be unique within the tenant and within this request. |
| `unitOfMeasures[].unitName` | string | yes | The display name of the unit of measure, for example 'Kilogram'. |

Example:

```json
{
  "unitOfMeasures": [
    {
      "unitCode": "KG",
      "unitName": "Kilogram"
    },
    {
      "unitCode": "G",
      "unitName": "Gram"
    }
  ]
}
```

## Response

`200` Success

Under `data` (bulkCreateUnitOfMeasuresOutput):

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `created` | array of object | yes | The created units of measure, in the same order as the input. Match entries to inputs by index. Read a record with GET inventory/unit-of-measures/:id when you need its stored state. |
| `created[].id` | string | yes | The unique identifier for the created unit of measure. |

## Response headers

- `Idempotency-Replayed` — Present and `true` only when this response replays a previously stored one for the same Idempotency-Key, rather than reflecting a live execution. Absent on a live response - never sent as `false`.

## Errors

| Code | Status |
| --- | --- |
| `DUPLICATE_UNIT_CODE` | 400 |
| `DUPLICATE_UNIT_CODE_IN_REQUEST` | 400 |
| `IDEMPOTENCY_KEY_CONFLICT` | 409 |
| `IDEMPOTENCY_PAYLOAD_MISMATCH` | 422 |

## Statuses

- `400` — Invalid request or business failure. Codes: DUPLICATE_UNIT_CODE, DUPLICATE_UNIT_CODE_IN_REQUEST
- `401` — Missing or invalid access token
- `403` — Not authorized
- `404` — Not found
- `409` — The Idempotency-Key is still being processed by another request.
- `422` — The Idempotency-Key was already used with a different request payload.
- `429` — Too many requests
- `500` — Internal server error