I am trying to send filename,id and format in request and expecting physical file from service

I am getting follow error

Thu Feb 08 13:10:09 CST 2018:ERROR:javax.mail.MessagingException: Missing start boundary
   javax.mail.MessagingException: Missing start boundary
    at javax.mail.internet.MimeMultipart.parsebm(MimeMultipart.java:713)
    at javax.mail.internet.MimeMultipart.parse(MimeMultipart.java:383)
    at javax.mail.internet.MimeMultipart.getCount(MimeMultipart.java:229)
    at com.eviware.soapui.impl.wsdl.submit.transports.http.support.attachments.MultipartMessageSupport.<init>(MultipartMessageSupport.java:60)
    at com.eviware.soapui.impl.wsdl.submit.transports.http.support.attachments.MimeMessageResponse.<init>(MimeMessageResponse.java:78)
    at com.eviware.soapui.impl.wsdl.submit.transports.http.support.attachments.WsdlMimeMessageResponse.<init>(WsdlMimeMessageResponse.java:57)
    at com.eviware.soapui.impl.wsdl.submit.filters.HttpPackagingResponseFilter.wsdlRequest(HttpPackagingResponseFilter.java:68)
    at com.eviware.soapui.impl.wsdl.submit.filters.HttpPackagingResponseFilter.afterAbstractHttpResponse(HttpPackagingResponseFilter.java:49)
    at com.eviware.soapui.impl.wsdl.submit.filters.AbstractRequestFilter.afterRequest(AbstractRequestFilter.java:64)
    at com.eviware.soapui.impl.wsdl.submit.transports.http.HttpClientRequestTransport.sendRequest(HttpClientRequestTransport.java:272)
    at com.eviware.soapui.impl.wsdl.WsdlSubmit.run(WsdlSubmit.java:119)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

I tried to set request header but with no success ,

Request

POST https://plmdev17x.3m.com/internal/services/AttachmentService HTTP/1.1
Accept-Encoding: gzip,deflate
Content-Type: text/xml;charset=UTF-8
SOAPAction: ""
Content-Length: 706
Host: plmdev17x.3m.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.1.1 (java 1.5)

<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:web="http://webservice.web.ematrix.mmm.com">
   <soapenv:Header/>
   <soapenv:Body>
      <web:getAttachmentWebService soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
         <oid xsi:type="xsd:string">6793.21112.14592.53466</oid>
         <format xsi:type="xsd:string">pdf</format>
         <fileName xsi:type="xsd:string">EmiratesETicket-1762310721900.pdf</fileName>
         <lock xsi:type="xsd:boolean">false</lock>
      </web:getAttachmentWebService>
   </soapenv:Body>
</soapenv:Envelope>

Response

HTTP/1.1 200 OK
Date: Thu, 08 Feb 2018 19:10:09 GMT
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=63072000; includeSubDomains
Content-Type: multipart/related; type="text/xml"; start="<D958624BE2260963741CF91D90873DB3>"; boundary="----=_Part_8_384892756.1518117009153"
Served-By: e-di01
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, must-revalidate
Keep-Alive: timeout=15, max=1000
Connection: Keep-Alive
Transfer-Encoding: chunked