# customUom

query · in the family [Custom unit of measure](/reference/custom-uom/)

## What it does

Look up one record — a custom unit of measure your group defines (a bundle, a crate).

A CustomUom by id, within the caller's OWN org-group family; requires authentication. A cross-tenant id reads as null (not-found) AND trips the rootId tripwire server-side.

## What happens

Reads only — changes nothing.

## Who may call it

Capability area: **Reading your records** — Looking up and listing the records of your organization.

- Owner
- System Administrator
- Manager
- Associate Manager
- Warehouse Associate
- Sales Associate
- An API key whose scope allows `api:customUom`

## Arguments

| Name | Type | Required | Notes |
| --- | --- | --- | --- |
| `id` | [ID](/types/#scalars) `ID!` | yes | The id of the record. |

## Returns

[CustomUom](/types/CustomUom/) — A custom unit of measure — a group-defined unit that MUST declare its dimension class + its conversion factor to the class BASE unit (STRICT: convertible by construction, e.g. Bolt = 25 m). The canned UoM registry (cannedUoms — the locked classes + maintained conversions) is registry DATA, not constructs; pack relationships (1 case = 12 each) are NOT UoM conversions. Referenced UoMs cannot be doomed (the guard arms with the Variant stock UoM).

## Example request

```graphql
query ExampleCustomUom($id: ID!) {
  customUom(id: $id) {
    id
    sysId
    type
    caption
    status
    parentId
    rootId
    createdAt
    updatedAt
    revisionNum
    revision
    dimensionClass
    factorToBase
    code
  }
}
```

Variables:

```json
{
  "id": "01900000-0000-7000-8000-37386ae00000"
}
```

## Example response

```json
{
  "data": {
    "customUom": {
      "id": "01900000-0000-7000-8000-37386ae00000",
      "sysId": "UM-EXMP-0000-000F",
      "type": "CustomUom",
      "caption": "Blue jeans",
      "status": "active",
      "parentId": "01900000-0000-7000-8000-065235280000",
      "rootId": "01900000-0000-7000-8000-a093dd800000",
      "createdAt": "2027-01-31T00:00:00.000Z",
      "updatedAt": "2027-01-31T00:00:00.000Z",
      "revisionNum": 1,
      "revision": "01900000-0000-7000-8000-b7960e180000",
      "dimensionClass": "count",
      "factorToBase": 1.5,
      "code": "BJ-001"
    }
  },
  "extensions": {
    "at": {
      "callId": "01EXAMPLE-CALL-ID",
      "version": {
        "requested": null,
        "serviced": {
          "name": "genesis",
          "number": 0
        }
      }
    }
  }
}
```

## Errors this call can answer

- `VALIDATION/INVALID` — Something in the request is not valid. ([VALIDATION](/errors/VALIDATION/))
- `AUTHN/REQUIRED` — Sign in to do this. ([AUTHN](/errors/AUTHN/))
- `AUTHZ/FORBIDDEN` — Your role does not allow this action. ([AUTHZ](/errors/AUTHZ/))
- `RATE_LIMIT/THROTTLED` — Too many requests in a short time. ([RATE_LIMIT](/errors/RATE_LIMIT/))
- `NOT_FOUND/*` — That record could not be found. ([NOT_FOUND](/errors/NOT_FOUND/))