purchaseRequisitions/action/initiateApproverCheckout to suspend Requisition TaskId parameter

In order to suspend a Purchase Requisition to make changes, we want to use initiateApproverCheckout action from purchaseRequisitions REST API.

RootTaskId and AssignedTaskId parameters are mandatory.

Method POST:

https://xxxxxxxxxocs.oraclecloud.com:123/fscmRestApi/resources/11.13.18.05/purchaseRequisitions/action/initiateApproverCheckout

Body:

{  "approverCheckoutContext": {    "RequisitionHeaderId": 300000041212236,    "RequisitioningBUId": 300000003359810,    "IdentificationKey": "REQ_300000041212236_1",    "RootTaskId": "09cc4db2-b873-4525-8a84-beddd839d095",    "AssignedTaskId": "09cc4db2-b873-4525-8a84-beddd839d095"  }}

Those Ids are visible in the Approval notificationURL but we are unable to find an API to retrieve these parameters ?

Also tried /action/retrieveCurrentApprovers but it does not retuen the task ID.

Thank you.

Sergio