Copper Termination Order is created but completing task is generating Error and Order didn't move to history after task completion

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://server.api.nep.mobinets.com/">
<soapenv:Header/>
<soapenv:Body>
<ser:arborSingleTerm_fCNATERM>
<!-Optional:->
<fAppType></fAppType>
<!-Optional:->
<fExc>XK45</fExc>
<!-Optional:->
<fCabinet>045M</fCabinet>
<!-Optional:->
<fDpoint>0001</fDpoint>
<!-Optional:->
<fSubno>44440013</fSubno>
<!-Optional:->
<fSubscr_Type>T</fSubscr_Type>
<!-Optional:->
<fWOID>444400173</fWOID>
<!-Optional:->
<fUsage_Type>T</fUsage_Type>
<!-Optional:->
<fOrder_Type>TESR</fOrder_Type>
<!-Optional:->
<fUserID>Mbaye</fUserID>
<!-Optional:->
<fOrderID>T</fOrderID>
<!-Optional:->
<arborOrderId>444400073</arborOrderId>
<!-Optional:->
<channel>1</channel>
<!-Optional:->
<surveyDt>Mbaye</surveyDt>
</ser:arborSingleTerm_fCNATERM>
</soapenv:Body>
</soapenv:Envelope>

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Header xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<wsse:Security soap:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<wsse:UsernameToken wsu:Id="UsernameToken-9b8c9147-34c6-4506-ba36-bc4e74ede0bc">
<wsse:Username>nep-api-key</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">mobinets@2017</wsse:Password>
</wsse:UsernameToken>