> ## Documentation Index
> Fetch the complete documentation index at: https://developer.jtl-software.com/llms.txt
> Use this file to discover all available pages before exploring further.

# UpdateItemCustomFieldValueInput

> Defines a single custom field value for an item. This structure connects a custom field definition with its actual value for a specific item.



**Kind**: `input`

## Fields

**`fieldId`**: `ID!` (required)

Unique identifier of the custom field definition. References the custom field that was previously created in the system.

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**`value`**: `String!` (required)

The actual value stored in this custom field. The format and content depend on the custom field type definition (text, number, date, etc.).

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**`valueCultureName`**: `String!` (required)

The culture name (e.g., "en-US", "de-DE") associated with the custom field value. This is important for localized fields where the value may vary based on the user's language or region. When returning those values from the server side this Format is always InvariantCulture. When sending values to the server side the culture name is optional and if not provided, it will be treated as InvariantCulture. Otherwise this value initializes a CultureInfo Object.