ChangeTaskContract

Project management service 1.8: Moves one task to another contract of the same project, re-pricing its un-invoiced time and adjusting allocations, payments and budgets.


Service	Project management 1.8
Endpoint	`POST https://app{server-number}.timelog.com/{account}/WebServices/ProjectManagement/V1_8/ProjectManagementServiceSecure.svc`
SOAPAction	`http://www.timelog.com/api/tlp/v1_8/ProjectManagementService/ChangeTaskContract`
Content-Type	`text/xml; charset=utf-8`
Authentication	A token from GetToken
Changes data	Yes
Safe to retry	Depends on the call

How it works

On success the task's rates and its allocations' rates are resolved on the target contract, open registrations are re-pointed to the new rates, the billing plan is adapted to the target contract model and the budgets of the old and new contract are recalculated. Only the task itself moves - not its sub-tasks.

Parameters

Each parameter has one label: Required, Conditional (required depending on other values) or Optional. Send them in the order shown.

taskGuidguid

Required

GUID of the task.

projectSubContractIdinteger

Required

Integer ID of the target contract - an Active contract of the task's own project. The task's current contract = no-op.

tokenSecurityToken

Required

The token from GetToken: Initials, Expires and Hash, sent back unchanged.

Request

POST /{account}/WebServices/ProjectManagement/V1_8/ProjectManagementServiceSecure.svc HTTP/1.1
Host: app{server-number}.timelog.com
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://www.timelog.com/api/tlp/v1_8/ProjectManagementService/ChangeTaskContract"

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
                  xmlns:pm="http://www.timelog.com/api/tlp/v1_8"
                  xmlns:tok="http://www.timelog.com/api/tlp/v1_3">
  <soapenv:Body>
    <pm:ChangeTaskContract>
      <pm:taskGuid>{taskGuid}</pm:taskGuid>
      <pm:projectSubContractId>{projectSubContractId}</pm:projectSubContractId>
      <pm:token>
        <tok:Initials>{Initials from GetToken}</tok:Initials>
        <tok:Expires>{Expires from GetToken, unchanged}</tok:Expires>
        <tok:Hash>{Hash from GetToken}</tok:Hash>
      </pm:token>
    </pm:ChangeTaskContract>
  </soapenv:Body>
</soapenv:Envelope>

curl -X POST "https://app{server-number}.timelog.com/{account}/WebServices/ProjectManagement/V1_8/ProjectManagementServiceSecure.svc" \
  -H "Content-Type: text/xml; charset=utf-8" \
  -H 'SOAPAction: "http://www.timelog.com/api/tlp/v1_8/ProjectManagementService/ChangeTaskContract"' \
  --data-binary @request.xml

import requests

URL = "https://app{server-number}.timelog.com/{account}/WebServices/ProjectManagement/V1_8/ProjectManagementServiceSecure.svc"
SOAP_ACTION = '"http://www.timelog.com/api/tlp/v1_8/ProjectManagementService/ChangeTaskContract"'

envelope = """<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
                  xmlns:pm="http://www.timelog.com/api/tlp/v1_8"
                  xmlns:tok="http://www.timelog.com/api/tlp/v1_3">
  <soapenv:Body>
    <pm:ChangeTaskContract>
      <pm:taskGuid>{taskGuid}</pm:taskGuid>
      <pm:projectSubContractId>{projectSubContractId}</pm:projectSubContractId>
      <pm:token>
        <tok:Initials>{Initials from GetToken}</tok:Initials>
        <tok:Expires>{Expires from GetToken, unchanged}</tok:Expires>
        <tok:Hash>{Hash from GetToken}</tok:Hash>
      </pm:token>
    </pm:ChangeTaskContract>
  </soapenv:Body>
</soapenv:Envelope>"""

response = requests.post(
    URL,
    data=envelope.encode("utf-8"),
    headers={"Content-Type": "text/xml; charset=utf-8", "SOAPAction": SOAP_ACTION},
    timeout=60,
)
result = parse_result(response)  # see "Responses and errors"

Replace every {…} placeholder with your own value.

Response

The call returns the standard response envelope. Check ResponseState first: a failed call still returns HTTP 200.

ResponseStatestring

Required

Success, Invalid or Error.

ErrorCodeinteger

0 on success, otherwise the error code. See Errors.

ReturnTask[]

Response<Task> with one item: the task after the move. IsReturnPaged true, TotalPageCount -1. Failure: Error envelope, empty Return. Same contract as now: Success, nothing changed.

Example response

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Body>
    <ChangeTaskContractResponse xmlns="http://www.timelog.com/api/tlp/v1_8">
      <ChangeTaskContractResult xmlns:a="http://api.timelog.com"
                                xmlns:b="http://www.timelog.com/api/tlp/v1_7"
                                xmlns:c="http://api.timelog.com/services/crm/1_2"
                                xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
        <a:Return>
          <b:Task>
            <a:Action>Original</a:Action>
            <a:IsCustomFieldsLoaded>false</a:IsCustomFieldsLoaded>
            <a:CustomFields i:nil="true"/>
            <a:IsExternalKeysLoaded>false</a:IsExternalKeysLoaded>
            <a:ExternalKeys i:nil="true"/>
            <b:ID>3f2504e0-4f89-41d3-9a0c-305000000001</b:ID>
            <b:TaskID>1001</b:TaskID>
            <b:Name>Example </b:Name>
            <b:FullName>Example full</b:FullName>
            <b:No>1001</b:No>
            <b:Description>Example</b:Description>
            <b:Link>Example</b:Link>
            <b:BudgetHours>0</b:BudgetHours>
            <b:BudgetAmount>0</b:BudgetAmount>
            <b:StartDate>2026-10-01T00:00:00</b:StartDate>
            <b:EndDate>2026-10-01T00:00:00</b:EndDate>
            <b:TaskTypeID>1001</b:TaskTypeID>
            <b:AdditionalTextIsRequired>false</b:AdditionalTextIsRequired>
            <b:ProjectSubContractID>1001</b:ProjectSubContractID>
            <b:HourlyRateID>1001</b:HourlyRateID>
            <b:IsReadyForInvoicing>false</b:IsReadyForInvoicing>
            <b:Details>
              <b:CustomerHeader>
                <c:ID>1001</c:ID>
                <c:Name>Example </c:Name>
                <c:No>1001</c:No>
                <c:GUID>3f2504e0-4f89-41d3-9a0c-305000000002</c:GUID>
              </b:CustomerHeader>
              <b:ProjectHeader>
                <b:ID>1001</b:ID>
                <b:ProjectGUID>3f2504e0-4f89-41d3-9a0c-305000000003</b:ProjectGUID>
                <b:Name>Example </b:Name>
                <b:No>1001</b:No>
                <b:IsActive>true</b:IsActive>
                <b:IsGeneralProject>false</b:IsGeneralProject>
                <b:StartDate>2026-10-01T00:00:00</b:StartDate>
                <b:EndDate>2026-10-01T00:00:00</b:EndDate>
                <b:MainContractID>1001</b:MainContractID>
              </b:ProjectHeader>
              <b:Type>
                <b:ID>1001</b:ID>
                <b:ID2>0</b:ID2>
                <b:Name>Example </b:Name>
                <b:Name2>Example</b:Name2>
              </b:Type>
              <b:CustomField>Example</b:CustomField>
            </b:Details>
            <b:State>
              <b:IsActive>true</b:IsActive>
            </b:State>
          </b:Task>
        </a:Return>
        <a:ReturnTypeDescription>Task</a:ReturnTypeDescription>
        <a:Request>…</a:Request>
        <a:ResponseState>Success</a:ResponseState>
        <a:Messages>
          <a:APIMessage>
            <a:Message>Duration of call was 0,0421337 sec.</a:Message>
            <a:Severity>Message</a:Severity>
            <a:ErrorCode>0</a:ErrorCode>
          </a:APIMessage>
        </a:Messages>
        <a:ErrorCode>0</a:ErrorCode>
        <a:IsReturnPaged>false</a:IsReturnPaged>
        <a:TotalPageCount>0</a:TotalPageCount>
      </ChangeTaskContractResult>
    </ChangeTaskContractResponse>
  </s:Body>
</s:Envelope>

Illustrative example: built from the service description (WSDL) in the same format as a real response, with made-up values. The Request block is shortened.

Errors

All errors come back with HTTP 200: check ResponseState, ErrorCode and Messages. The errors every operation can return (expired or invalid token, API not enabled, HTTPS required, general errors) are listed once in Responses and errors.

Errors specific to this operation:

ResponseState	ErrorCode	Message	What it means	What to do
Error	40001	Error during call on TimeLog.API, Message 'Invalid contract move. The target contract belongs to a different project (Expected project ID: {current contract's project}, Was: {target contract's project})'	ChangeTaskContract with a contract of another project. Nothing is changed.	Use a contract of the task's own project.
Error	40001	Error during call on TimeLog.API, Message 'It is not allowed to change project sub contract on a Parent Task, TaskID='{TaskID}''	Nothing is changed.	—
Error	40001	Error during call on TimeLog.API, Message 'Unable to change task project sub contract from:'{current contract}' to: '{target contract}', Reason: {reason}.'	Contract-sub-group sub-task, or invoiced / vouchered registrations or payments.	Create a new task on the target contract for future time.
Error	40001	Error during call on TimeLog.API, Message 'Since the target contract is completed or cancelled, the task cannot be moved to target contract'	ChangeTaskContract to a Completed or Cancelled contract. Nothing is changed.	Reopen the contract or choose an active one.
Error	40001	Error during call on TimeLog.API, Message 'Unable to change the contract on the task because the task has time registration(s) or payment(s) that falls within closed accounting period'	ChangeTaskContract on a task with time or payments in a closed accounting period. Nothing is changed.	Create a new task on the target contract for future time.

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