Remove Attachments from Checklist Item tasks.template.checklist.removeAttachments

If you are developing integrations for Bitrix24 using AI tools (Codex, Claude Code, Cursor), connect to the MCP server so that the assistant can utilize the official REST documentation.

Scope: task

Who can execute the method: a user with permissions to modify the task template

The method tasks.template.checklist.removeAttachments removes attachments from a checklist item in the task template.

Method Parameters

Required parameters are marked with *

Name `type`	Description
templateId* `integer`	The identifier of the task template. The identifier of the task template can be obtained when creating a new template
checkListItemId* `integer`	The identifier of the checklist item. The identifier of the checklist item can be obtained when creating a new item or by using the method to get the list of items
attachmentsIds* `array`	An array of attachment identifiers to be removed

Code Examples

How to Use Examples in Documentation

cURL (Webhook)

cURL (OAuth)

PHP

BX24.js

PHP CRest

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{
          "templateId": 139,
          "checkListItemId": 37,
          "attachmentsIds": [
            1119,
            1121
          ]
        }' \
        https://**put_your_bitrix24_address**/rest/**put_your_user_id_here**/**put_your_webhook_here**/tasks.template.checklist.removeAttachments

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{
          "templateId": 139,
          "checkListItemId": 37,
          "attachmentsIds": [
            1119,
            1121
          ],
          "auth": "**put_access_token_here**"
        }' \
        https://**put_your_bitrix24_address**/rest/tasks.template.checklist.removeAttachments

try
        {
            const response = await $b24.callMethod(
                'tasks.template.checklist.removeAttachments',
                {
                    templateId: 139,
                    checkListItemId: 37,
                    attachmentsIds: [1119, 1121]
                }
            );
        
            const result = response.getData().result;
            console.log(result);
        }
        catch (error)
        {
            console.error(error);
        }

try {
            $response = $b24Service
                ->core
                ->call(
                    'tasks.template.checklist.removeAttachments',
                    [
                        'templateId' => 139,
                        'checkListItemId' => 37,
                        'attachmentsIds' => [1119, 1121]
                    ]
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            print_r($result);
        } catch (Throwable $e) {
            echo $e->getMessage();
        }

BX24.callMethod(
            'tasks.template.checklist.removeAttachments',
            {
                templateId: 139,
                checkListItemId: 37,
                attachmentsIds: [1119, 1121]
            },
            function(result)
            {
                if (result.error())
                {
                    console.error(result.error());
                }
                else
                {
                    console.log(result.data());
                }
            }
        );

require_once('crest.php');
        
        $result = CRest::call(
            'tasks.template.checklist.removeAttachments',
            [
                'templateId' => 139,
                'checkListItemId' => 37,
                'attachmentsIds' => [1119, 1121]
            ]
        );
        
        print_r($result);

Response Handling

HTTP Status: 200

{
            "result": {
                "checkListItem": {
                    "id": 37,
                    "copiedId": null,
                    "userId": 503,
                    "createdBy": null,
                    "parentId": 23,
                    "title": "4. Prepare the dashboard and send the link",
                    "sortIndex": 2,
                    "displaySortIndex": "",
                    "isComplete": false,
                    "isImportant": true,
                    "completedCount": 0,
                    "members": [
                        {
                            "id": "547",
                            "type": "A",
                            "name": "Anna Peterson",
                            "personalPhoto": "57129",
                            "personalGender": "",
                            "image": "https://mysite.com/b17053/resize_cache/57129/c0120a8d7c10d63c83e32398d1ec4d9e/main/137/137bfa78b877be117e75f1ac8652834a/anna.png",
                            "isCollaber": false
                        }
                    ],
                    "attachments": [],
                    "nodeId": null,
                    "templateId": 139
                }
            },
            "time": {
                "start": 1773298408,
                "finish": 1773298408.806751,
                "duration": 0.806751012802124,
                "processing": 0,
                "date_start": "2026-03-12T09:53:28+01:00",
                "date_finish": "2026-03-12T09:53:28+01:00",
                "operating_reset_at": 1773299008,
                "operating": 0
            }
        }

Returned Data

Name `type`	Description
result `object`	An object containing the response data (detailed description)
time `time`	Information about the request execution time

Object result

Name `type`	Description
checkListItem `object`	The checklist item after the attachments have been removed (detailed description)

Object checkListItem

Name `type`	Description
id `integer`	Identifier of the checklist item
copiedId `integer`	Identifier of the original item when copied, if applicable
userId `integer`	Identifier of the user in the context of which the object is created
createdBy `integer`	Identifier of the item creator
parentId `integer`	Identifier of the parent item. A value of `0` indicates a root item
title `string`	Text of the checklist item
sortIndex `integer`	Sorting index. The lower the value, the higher the item in the list or sublist
displaySortIndex `string`	Auxiliary value for display order
isComplete `boolean`	Status of the item completion
isImportant `boolean`	Importance flag of the item
completedCount `integer`	Number of completions of the item
members `array`	Array of objects with description of participants. If there is no data, an empty array `[]` is returned
attachments `object`	Object with description of attachments. If there is no data, an empty array `[]` is returned
nodeId `integer`	Service identifier of the node, if used
templateId `integer`	Identifier of the task template

Object members

Name `type`	Description
id `string`	Identifier of the user
type `string`	Role of the user in the checklist item. Possible values: `A` — Participant `U` — Observer
name `string`	User's name
personalPhoto `string`	Identifier of the user's avatar file on Drive
personalGender `string`	Gender of the user. Possible values: `M` — Male `F` — Female
image `string`	Link to the user's avatar
isCollaber `boolean`	Indicator that the user is an external participant

Object attachments

Name `type`	Description
attachmentId `string`	Identifier of the file on Drive in the format `n<fileId>`, where the key is the identifier of the attachment

Error Handling

HTTP Status: 400

{
            "error": "100",
            "error_description": "Could not find value for parameter {templateId}"
        }

Name `type`	Description
error `string`	String error code. It may consist of digits, Latin letters, and underscores
error_description `error_description`	Textual description of the error. The description is not intended to be shown to the end user in its raw form

Possible Error Codes

Status	Code	Description	Value
`400`	`100`	Could not find value for parameter	Required parameter `templateId` not provided
`400`	`100`	Bitrix\Tasks\CheckList\Internals\CheckList All parameters in the constructor must have real class type	Required parameter `checkListItemId` not provided
`400`	`100`	Could not find value for parameter	Required parameter `attachmentsIds` not provided
`400`	`100`	Invalid value {} to match with parameter {attachmentsIds}. Should be value of type array.	Empty or invalid type for `attachmentsIds` provided
`400`	`0`	Incorrect value [] specified for field [ENTITY_ID] in element [, ]	Non-existent, empty, or invalid type for `checkListItemId` provided
`400`	`0`	Changing the item: action not available	User does not have permission to modify the task template

Statuses and System Error Codes

HTTP Status: 20x, 40x, 50x

The errors described below may occur when calling any method.

Status	Code Error Message	Description
`500`	`INTERNAL_SERVER_ERROR` Internal server error	An internal server error has occurred. Please contact the server administrator or Bitrix24 technical support
`500`	`ERROR_UNEXPECTED_ANSWER` Server returned an unexpected response	An internal server error has occurred. Please contact the server administrator or Bitrix24 technical support
`503`	`QUERY_LIMIT_EXCEEDED` Too many requests	The request intensity limit has been exceeded
`405`	`ERROR_BATCH_METHOD_NOT_ALLOWED` Method is not allowed for batch usage	The current method is not permitted for calls using batch
`400`	`ERROR_BATCH_LENGTH_EXCEEDED` Max batch length exceeded	The maximum length of parameters passed to the batch method has been exceeded
`401`	`NO_AUTH_FOUND` Wrong authorization data	Invalid access token or webhook code
`400`	`INVALID_REQUEST` Https required	The HTTPS protocol is required for method calls
`503`	`OVERLOAD_LIMIT` REST API is blocked due to overload	The REST API is blocked due to overload. This is a manual individual block; please contact Bitrix24 technical support to lift it
`403`	`ACCESS_DENIED` REST API is available only on commercial plans	The REST API is only available on commercial plans
`403`	`INVALID_CREDENTIALS` Invalid request credentials	The user associated with the access token or webhook used to call the method lacks the necessary permissions
`404`	`ERROR_MANIFEST_IS_NOT_AVAILABLE` Manifest is not available	The manifest is not available
`403`	`insufficient_scope` The request requires higher privileges than provided by the webhook token	The request requires higher privileges than those provided by the webhook token
`401`	`expired_token` The access token provided has expired	The provided access token has expired
`403`	`user_access_error` The user does not have access to the application	The user does not have access to the application. This means that the application is installed, but the portal administrator has restricted access to this application to specific users only
`500`	`PORTAL_DELETED` Portal was deleted	The public part of the site is closed. To open the public part of the site on an on-premise installation, disable the "Temporary closure of the public part of the site" option. Path to the setting: Desktop > Settings > Product Settings > Module Settings > Main Module > Temporary closure of the public part of the site

Continue Learning

Add Attachments from Drive

Overview of Methods

Remove Attachments from Checklist Item tasks.template.checklist.removeAttachments

Method ParametersMethod Parameters

Code ExamplesCode Examples

Response HandlingResponse Handling

Returned DataReturned Data

Object resultObject result

Object checkListItemObject checkListItem

Object membersObject members

Object attachmentsObject attachments

Error HandlingError Handling

Possible Error CodesPossible Error Codes

Statuses and System Error CodesStatuses and System Error Codes

Continue LearningContinue Learning