**Source URL:** https://limited.veevavault.dev/sitevault/mdl/component-types/userdefinedclass.md

# Userdefinedclass

**Class: ** `code`

Allow users to apply custom business logic on objects when a record is created, updated, or deleted.

Learn more about <a href="/vault-sdk/shared-code/udc">user-defined classes</a>.

| Attribute | Metadata | Description |
| --- | --- | --- |
| label | Type: StringMax length: 60 | UI-friendly string in the Vault's base language. |
| active | Type: Boolean | Indicates whether the component is active. |
| checksum | Type: StringMax length: 1500 | Used to check data for errors. |
| source_code | Type: SdkCodeMax length: 1048576 | The source of this user-defined class and code used to create and edit metadata. Custom means this UDC was developed with the Vault Java SDK. |

### Supported Operations {#supported-operations}

| Operation | Support |
| --- | --- |
| Create | No |
| Recreate | No |
| Alter | No |
| Drop | No |
| Rename | No |
| Describe | No |
| Generate Recreate | No |
| Queryable | Yes |


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