in another thread Chan-Seok Jeon showed the proper structure of the body internal table. here it is, and thanks about Chan-Seok Jeon.
* Set Header
APPEND 'Content-Type: text/xml; charset=euc-kr' TO LT_REQ_HEAD.
* Set Parameter
APPEND '<?xml version="1.0" encoding="euc-kr"?> ' TO LT_REQ_BODY.
APPEND '<root> ' TO LT_REQ_BODY.
APPEND '<params> ' TO LT_REQ_BODY.
APPEND '<param id="admMode" type="STRING">Y</param> ' TO LT_REQ_BODY.
APPEND '<param id="block" type="STRING">A23</param> ' TO LT_REQ_BODY.
APPEND '<param id="gubun" type="STRING">lot</param> ' TO LT_REQ_BODY.
APPEND '<param id="ocomp" type="STRING"></param> ' TO LT_REQ_BODY.
APPEND '<param id="path" type="STRING"></param> ' TO LT_REQ_BODY.
APPEND '<param id="shipno" type="STRING">S630</param> ' TO LT_REQ_BODY.
APPEND '<param id="userid" type="STRING">AAAAAAAAAA</param> ' TO LT_REQ_BODY.
APPEND '<param id="plate" type="STRING">Y</param> ' TO LT_REQ_BODY.
APPEND '<param id="print_view" type="STRING">V</param> ' TO LT_REQ_BODY.
APPEND '</params> ' TO LT_REQ_BODY.
APPEND '<dataset id="ds_input"> ' TO LT_REQ_BODY.
APPEND '<colinfo id="chk" size="1" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="dwgno" size="2" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="fab" size="3" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="filechk" size="3" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="filename" size="30" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="grp" size="1" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="lot" size="3" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="revno" size="3" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<colinfo id="ship" size="5" type="STRING"/> ' TO LT_REQ_BODY.
APPEND '<record> ' TO LT_REQ_BODY.
APPEND '<chk>1</chk> ' TO LT_REQ_BODY.
APPEND '<dwgno>01</dwgno> ' TO LT_REQ_BODY.
APPEND '<fab>COM</fab> ' TO LT_REQ_BODY.
APPEND '<filechk>Oilechk> ' TO LT_REQ_BODY.
APPEND '<filename>XXXXXXXXXXXXX.XXX</filename> ' TO LT_REQ_BODY.
APPEND '<grp>4L</grp> ' TO LT_REQ_BODY.
APPEND '<lot>A23</lot> ' TO LT_REQ_BODY.
APPEND '<revno>0</revno> ' TO LT_REQ_BODY.
APPEND '<ship>S630</ship> ' TO LT_REQ_BODY.
APPEND '</record> ' TO LT_REQ_BODY.
APPEND '</dataset> ' TO LT_REQ_BODY.
APPEND '</root> ' TO LT_REQ_BODY.
You are just passing the exact structure of the xml to http_post.
thanks,
Erik