unable update Negotiation response Using Rest API

Summary:
unable update Negotiation response Using Rest API

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i used this api

fscmRestApi/resources/11.13.18.05/supplierNegotiationResponses/484221/child/sections/1996054/child/requirements/300000880825543/child/responseValues/3841321

with patch mode to update the score

 {                  "Score":15        }     

and i received this message

{    "title": "Bad Request",    "status": "400",    "o:errorDetails": [        {            "detail": "The action \"update\" is not enabled.",            "o:errorCode": "27507"        }    ]}

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