AJAX :: Error While Creating Batch Request Using O - Data Framework

I was trying to send a Batch request with O-data framework given below is the code sequence.

updateService = new Sys.Data.OpenDataServiceProxy("http://localhost/myservice.svc");
actionSequence = updateService.createActionSequence();
actionSequence.addUpdateAction(newWr, workRequest.__metadata.uri);
try {
actionSequence.execute(
function () {
alert("Success");
},
function (error) {
alert(error._message);
}
);
}
catch (e) {
}

but this is failing because on response in the end i am geting some extra sections such as undefined ..given below is the response that i am geting in the end u can find the last 3-4 lines and junk data. which is

undefined undefined HTTP/1.1
Host: localhost
Accept: application/json
Accept-Charset: utf-8
The RESPONSE DATA
**************************
--batch_5d5c-5276-934b
Content-Type: multipart/mixed;boundary=changeset_ef52-ebe1-2137
--changeset_ef52-ebe1-2137
Content-Type: application/http
Content-Transfer-Encoding: binary
MERGE http://localhost/myservice.svc/data('Document_dd879945-cdd8-4336-95d3-365c52c617bd') HTTP/1.1
Host: localhost
Accept: application/json
Accept-Charset: utf-8
Content-Type: application/json;charset=utf-8
{"__metadata":{"uri":"http://localhost/myservice.svc/data('Document_dd879945-cdd8-4336-95d3-365c52c617bd')","type":"Accelrys.Services.DataContracts.WorkRequest"},"VaultId":"Document_dd879945-cdd8-4336-95d3-365c52c617bd","WorkRequestId":"WR.fee0a427-0652-4493-a785-d4b81f26549c","Title":"TEst
WR from Arun PP - Modified By Arun","Project":null,"CreatedBy":"sqalab\vault.admin","VaultPath":"","CreatedOn":"Mar 27,2011","ModifiedOn":"Mar 27,2011","ModifiedBy":"sqalab\vault.admin","Status":"Not Started","NeededBy":"Dec 31,2000"}
--changeset_ef52-ebe1-2137
Content-Type: application/http
Content-Transfer-Encoding: binary
undefined undefined HTTP/1.1
Host: localhost
Accept: application/json
Accept-Charset: utf-8
--changeset_ef52-ebe1-2137--
--batch_5d5c-5276-934b--