Activity(request) in ifs

Hi Guys, 

I want to use FileOperationHelper:Writefile request to write the file in my local path , but dont know how to pass parameter.From web service tester I found the below request:

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <FILEOPERATIONHELPER_WRITEFILE_REQUEST
            xmlns="urn:ifsworld-com:schemas:file_operation_helper_write_file_request" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <DOC_CLASS>ABC</DOC_CLASS>
            <DOC_NO>ABC</DOC_NO>
            <DOC_SHEET>ABC</DOC_SHEET>
            <DOC_REV>ABC</DOC_REV>
            <DOC_TYPE>ABC</DOC_TYPE>
            <FILE_NO>3.14</FILE_NO>
            <TICKET>ABC</TICKET>
            <CHECK_OUT_FILE_NAME>ABC</CHECK_OUT_FILE_NAME>
        </FILEOPERATIONHELPER_WRITEFILE_REQUEST>
    </soap:Body>
</soap:Envelope>
 

In this request, I am not sure what is mean of ticket parameter and CHECK_OUT_FILE_NAME , Is thereany one who has idea of this