Which function module i should use in mereq001 for warning message

Question

hi all,
when creating purchase requistion(me51n) with item and plant and material etc.when we enter different plant  for the second item which is not there in first item. we should get the warning message in the popup
for this i have used
fuction module EXIT_SAPLMEREQ_005
written the following code.
  INCLUDE ZXM02U05                                                   *
CHECK SY-TCODE = 'ME51N'.
TABLES MARC.
DATA : BEGIN OF I_MARC OCCURS 0,
       WERKS LIKE MARC-WERKS,
       BNFPO LIKE EBAN-BNFPO,
       END OF I_MARC.
DATA : I_WERKS LIKE MEREQ_ITEM-WERKS.
read table I_MARC index 1.
if sy-subrc <> 0.
IF I_MARC-WERKS IS  INITIAL.
   I_MARC-BNFPO = IM_DATA_NEW-BNFPO.
   I_MARC-WERKS = IM_DATA_NEW-WERKS.
append I_MARC.
endif.
MOVE IM_DATA_OLD-WERKS TO I_WERKS.
elseif IM_DATA_NEW-BNFPO > I_MARC-BNFPO
       and I_WERKS <> IM_DATA_NEW-WERKS.
  CALL FUNCTION 'POPUP_DISPLAY_MESSAGE'
    EXPORTING
    TITEL         =
      MSGID         = 'ZMMMSG'
      MSGTY         = 'W'
      MSGNO         = 001.
    MSGV1         =0
    MSGV2         =
    MSGV3         =
    MSGV4         =
ENDIF.
but after entering the data for first item 00010 ,data is storing in the internal table. but when i entered the data for item 00020 it storing the data in internal table. but item 00010 data is not appearing in the internal table when we give item 00020 data . i have checked in the debugging.
please advise me what to do for the above requirement.
thanks in advance
rama.

Answer 1

Hi Roy,
You should use BI SDK for Java to connect to BW from Web Dynpro (https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/documents/a1-8-4/how%20to%20use%20the%20bi%20java%20sdk%20in%20a%20web%20dynpro%20application.pdf)
http://help.sap.com/saphelp_nw04/helpdata/en/6e/011e681cf74ab4b3acf73f77653405/frameset.htm
https://media.sdn.sap.com/public/html/submitted_docs/BW/BI_SDK_JavaDocs/bi_sdk_doc/docs/documentation.html
/people/moya.watson/blog/2004/04/05/the-bi-java-sdk-whats-in-it-for-you
/people/moya.watson/blog/2004/12/27/three-new-how-to-guides-for-the-bi-java-sdk
Best regards, Maksim Rashchynski.