# Delete target book segment

`DELETE` `/api/v1/crm-connections/{crm_connection_id}/target-books/{target_book_id}/segments/{segment_id}`

Returns 400 if the segment is the last one on the book — a target book
must always have at least one segment. Returns the full updated target book.

## Path parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| crm_connection_id | string | yes | UUID of the CRM connection |
| target_book_id | string | yes | Salesforce ID of the target book |
| segment_id | string | yes | Salesforce ID of the segment |

## Response

`200 OK` — `application/json`

| Field | Type | Description |
|-------|------|-------------|
| id | string | Salesforce ID of the target book record |
| name | string | Target book name |
| status | string | Status: Active or Deleted |
| maximum_capacity | number | Maximum account capacity |
| ownership_field | string | Salesforce ownership field API name |
| created_at | string | ISO-8601 creation timestamp |
| updated_at | string | ISO-8601 last-updated timestamp |
| activity_threshold | object | Assigned activity threshold (if any) |
| activity_threshold.id | string | Salesforce ID of the threshold definition |
| activity_threshold.name | string | Name of the activity threshold |
| segments | array[object] | Segments with their conditions (present when include_segments=true) |
| reps | array[object] | Active assigned reps (present when include_reps=true) |

## Errors

| Status | Description |
|--------|-------------|
| 400 | Bad Request |
| 403 | Forbidden |
| 404 | Not Found |
| 502 | Bad Gateway |