SAP SOLMAN ServiceDesk WebService throws Error code 13

Hi,

I am trying to access SOLMAN Service Desk WebService ICT_SERVICE_WEB_SERVICE_API . I give the SOAP request as below. It throws me  error code 13.

What does Error code 13 means ?

Do I need to use any Specific Header  ?

Do I need to add any specific Role to the User ? With Same User I am able to login to SOLMAN UI and able to create incident/ update incidents.

Request:

----------------------------------

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:sap-com:document:sap:soap:functions:mc-style">

   <soapenv:Header/>

   <soapenv:Body>

      <urn:ListUnclosedIncidents>

         <SystemGuid>5217000C1D3F08C0E10080008DCA4C31</SystemGuid>

      </urn:ListUnclosedIncidents>

   </soapenv:Body>

</soapenv:Envelope>

Response:

--------------------------------

<soap-env:Envelope xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">

   <soap-env:Header/>

   <soap-env:Body>

      <n0:ListUnclosedIncidentsResponse xmlns:n0="urn:sap-com:document:sap:soap:functions:mc-style">

         <Errors>

            <item>

               <ErrorCode>13</ErrorCode>

               <Val1>5217000C1D3F08C0E10080008DCA4C31</Val1>

               <Val2/>

               <Val3/>

               <Val4/>

            </item>

         </Errors>

         <Incidents/>

      </n0:ListUnclosedIncidentsResponse>

   </soap-env:Body>

</soap-env:Envelope>

Thanks,

Abhi