# CRUD: Update a unit of measure

Endpoint: PUT /v1/object/unit-of-measure/{id}
Version: 2025-12-17

## Header parameters:

  - `Accept-Encoding` (string)
    Include the Accept-Encoding: gzip header to compress responses as a gzipped file. It can significantly reduce the bandwidth required for a response. 

If specified, Zuora automatically compresses responses that contain over 1000 bytes of data, and the response contains a Content-Encoding header with the compression algorithm so that your client can decompress it.

  - `Content-Encoding` (string)
    Include the Content-Encoding: gzip header to compress a request. With this header specified, you should upload a gzipped file for the request payload instead of sending the JSON payload.

  - `Authorization` (string)
    The value is in the Bearer {token} format where {token} is a valid OAuth token generated by calling Create an OAuth token.

  - `Zuora-Entity-Ids` (string)
    An entity ID. If you have Zuora Multi-entity enabled and the OAuth token is valid for more than one entity, you must use this header to specify which entity to perform the operation in. If the OAuth token is only valid for a single entity, or you do not have Zuora Multi-entity enabled, you do not need to set this header.

  - `Zuora-Track-Id` (string)
    A custom identifier for tracing the API call. If you set a value for this header, Zuora returns the same value in the response headers. This header enables you to associate your system process identifiers with Zuora API calls, to assist with troubleshooting in the event of an issue.

The value of this field must use the US-ASCII character set and must not include any of the following characters: colon (:), semicolon (;), double quote ("), and quote (').

## Query parameters:

  - `rejectUnknownFields` (boolean)
    Specifies whether the call fails if the request body contains unknown fields.
With rejectUnknownFields set to true, Zuora returns a 400 response if
the request body contains unknown fields. The body of the 400 response is:

json
{
    "message": "Error - unrecognised fields"
}


By default, Zuora ignores unknown fields in the request body.

## Path parameters:

  - `id` (string, required)
    Object id

## Request fields (application/json):

  - `Active` (boolean)
    Indicates if the UOM is available for new product rate plans. The default value is true.
Character limit: 5 Values: true, false

  - `DecimalPlaces` (integer)
    The number of digits to the right of the decimal point that you want to measure for the unit. To use whole numbers only, set this value to 0. You can't change this value after this UOM is used in any product, subscription, or usage. Character limit: 1 Values: an integer between 0 and 9, exclusive

  - `DisplayedAs` (string)
    The name of the UOM that you want displayed on invoices. The default value is the UomName field value. Character limit: 50 Values: A string of 50 characters or fewer

  - `RoundingMode` (string)
    Specifies whether to round the UOM value up or down when the value exceeds the DecimalPlaces field value. The default value is Up.
Character limit: 4 Values: Up, Down

  - `UomName` (string)
    The name of the UOM, such as license or GB. This name is displayed in query results and in the web-based UI labels. If you want a different name to be displayed on invoices, then use the DisplayedAs field to provide the invoice label.
Character limit: 50 Values: a string of 50 characters or fewer

## Response 200 fields (application/json):

  - `Id` (string)
    Example: "2c93808457d787030157e030232f3748"

  - `Success` (boolean)
    Example: true

## Response 401 fields (application/json):

  - `message` (string)
    Error message.

If the error message is "Authentication error", ensure that the Authorization request header contains valid authentication credentials, then retry the request. See [Authentication](https://developer.zuora.com/rest-api/general-concepts/authentication/) for more information.

If the error message is "Failed to get user info", retry the request.