---
title: "Update SKU specification"
method: PUT
path: "/api/catalog/pvt/stockkeepingunit/{skuId}/specification"
tags: ["SKU specification"]
---

# Update SKU specification

`PUT /api/catalog/pvt/stockkeepingunit/{skuId}/specification`

Updates an existing specification on an existing SKU. This endpoint only updates the `FieldValueId`.

## Permissions

Any user or [API key](https://developers.vtex.com/docs/guides/api-authentication-using-api-keys) must have at least one of the appropriate [License Manager resources](https://help.vtex.com/en/tutorial/license-manager-resources--3q6ztrC8YynQf6rdc6euk3) to be able to successfully run this request. Otherwise they will receive a status code `403` error. These are the applicable resources for this endpoint:

| **Product** | **Category** | **Resource** |
| --------------- | ----------------- | ----------------- |
| Catalog | Content | **SKUs** |

There are no applicable [predefined roles](https://help.vtex.com/en/tutorial/predefined-roles--jGDurZKJHvHJS13LnO7Dy) for this resource list. You must [create a custom role](https://help.vtex.com/en/tutorial/roles--7HKK5Uau2H6wxE1rH5oRbc#creating-a-role) and add at least one of the resources above in order to use this endpoint. To learn more about machine authentication at VTEX, see [Authentication overview](https://developers.vtex.com/docs/guides/authentication).

>❗ To prevent integrations from having excessive permissions, consider the [best practices for managing API keys](https://help.vtex.com/en/tutorial/best-practices-api-keys--7b6nD1VMHa49aI5brlOvJm) when assigning License Manager roles to integrations.

## Path parameters

- `skuId` integer, required

## Headers

- `Content-Type` string, required
- `Accept` string, required

## Request body

- object
  - `Id` integer, required — Specification and SKU association unique identifier. This field cannot be updated.
  - `SkuId` integer — SKU unique identifier. This field cannot be updated.
  - `FieldId` integer, required — Specification field unique identifier. This field cannot be updated.
  - `FieldValueId` integer, required — Specification value unique identifier. This field can only be updated with other values of the same `FieldId`.
  - `Text` string — Specification value name. This field is automatically updated if the `FieldValue` is updated. Otherwise, the value cannot be modified.

## Response `200`

OK

- SKUSpecificationResponse[]
  - `Id` integer — ID of the association of the specification and the SKU. This ID is used to update or delete the specification.
  - `SkuId` integer — SKU ID.
  - `FieldId` integer — Specification field ID.
  - `FieldValueId` integer — Specification value ID. Required only for `FieldTypeId` as `5`, `6` and `7`.
  - `Text` string — Value of specification. Only for `FieldTypeId` different from `5`, `6` and `7`.

---

[API](https://skmtc.dev/vtex/apis/catalog-api.md) · [All operations](https://skmtc.dev/vtex/apis/catalog-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/vtex/catalog-api/revisions/ba9fbd1b771f/schema)