> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://developer-test.atomicwork.com/llms.txt.
> For full documentation content, see https://developer-test.atomicwork.com/llms-full.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://developer-test.atomicwork.com/_mcp/server.

# patchCustomObjectByDisplayId

Partial update a custom object instance by display ID.

Partially updates a custom object instance identified by display ID. Only fields sent
in `form_fields` are changed, and the activity log records only those patched fields.

## Parameters

| Name          | Type   | Required | Description                                                           |
| ------------- | ------ | -------- | --------------------------------------------------------------------- |
| `displayId`   | string | Yes      | Display ID formatted as `PREFIX-NUMBER` (e.g., "VEN-42", "VISA-100"). |
| `form_fields` | object | Yes      |                                                                       |