error while cancelling the order line in oracle fusion with rest api getting error 'Locked by user'

error while cancelling the order line in oracle fusion with rest api getting error Locked by another user. Try again later.

api used

https://etvs-dev1.fa.us8.oraclecloud.com/fscmRestApi/resources/11.13.18.05/salesOrderActionRequests

below is the payload

{    "ActionCode": "ORA_FOM_CANCEL_LINE",    "CancelReasonCode": "ORA_WRONG_ITEM",    "Comments": "Incorrect Item ordered",    "requests": [        {            "FulfillLineId": 100000768377139        }    ]}