MMS7 request in JAVA with body and attachment returning error

Please help me writing a java request which can send attachment and a body for the below request,I am able to send and attachment along with the mms but unable to send the data with content-id “132c4ca56a209475”.

Please find the link below,
http://manage.mblox.com/developers/mms.html#sendsavedmms

Request :

POST /mm7/v1 HTTP/1.1
Authorization: Basic dW5pdmyc2FsLXZhcj2YWwtdmFzcC1wd2Q=
Host: api.Mblox.com
Accept: */*
Content-Type: multipart/related; boundary="mainBoundary"; type="text/xml"; start="<mm7-start>"
SOAPAction: "http://www.3gpp.org/ftp/Specs/archive/23_series/23.140/schema/REL-6-MM7-1-4"
Content-Length: 45454
X-Mblox-Operator-Id: 31003
Expect: 100-continue

--mainBoundary
Content-Type: text/xml; charset=utf-8
Content-ID: <mm7-start>

```xml
<?xml version="1.0" encoding="utf-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Header>
        <TransactionID xmlns="http://www.3gpp.org/ftp/Specs/archive/23_series/23.140/schema/REL-6-MM7-1-4" SOAP-ENV:mustUnderstand="1">555e29f8879be</TransactionID>
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
        <SubmitReq>
            <MM7Version>6.8.0</MM7Version>
            <DeliveryReport>true</DeliveryReport>
            <SenderIdentification>
                <VASPID>spUsdstW2u6GbvnMOsdseXrBa7NNLwTdKL</VASPID>
                <VASID>61295</VASID>
                <SenderAddress>
                    <ShortCode>111122</ShortCode>
                </SenderAddress>
            </SenderIdentification>
            <Recipients>
                <To>
                    <Number>16179593069</Number>
                </To>
            </Recipients>
            <Subject>My first MM7 Message</Subject>
            <ExpiryDate>2015-05-24T18:54:48+00:00</ExpiryDate>
            <TimeStamp>2015-05-21T18:54:48+00:00</TimeStamp>
            <Content allowAdaptations="false" href="cid:generic_content_id"/>
        </SubmitReq>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

--mainBoundary
Content-Type: multipart/related; start="<mms.smil>";
         boundary="subBoundary"; type="text/xml"
Content-ID: <generic_content_id>

--subBoundary
Content-Type: text/plain; charset=utf-8
Content-ID: <132c4ca56a209475>

MM7 Test Text
--subBoundary
Content-Type: application/smil; charset=utf-8
Content-ID: <mms.smil>

<?xml version="1.0" encoding="UTF-8"?><smil><head><layout><root-layout width="100%" height="100%"/><region id="Text" top="50%" left="0" height="50%" width="100%" fit="hidden"/></layout></head><body><par><text src="cid:132c4ca56a209475" region="Text"/></par></body></smil>
--subBoundary--

--mainBoundary--

Thanks a ton in advance.