URGENT, bdc uploaded wrong data

Question

Dear all SAP-ABAP consulatants,
                                                 i would request you people to kindly help me out from my scenario.
i need to delete records from transaction 'cs02' , where in  by validating the field so that  it wont delete  the existing records.
the fields are matnr,werks,stlan,idnrk,meng,meins,postp
From all d fields above i need to delete the record for field stlan,idnkr meng,meins &postp.
MY BDC ISNT WORKING IN A PROPER MANNER ITS DELETING ALL D RECORDS FOR DIFFERENT MATERIAL NUMBERS.
ths code is
report Z_PP_BOM_DEL_SCRAP
       no standard page heading line-size 255.
include bdcrecx1.
start-of-selection.
data:begin of it_data occurs 0,
     matnr(18),    "Material
    idnrk(18),    "Component
     end of it_data.
Parameters:p_file type IBIPPARMS-PATH.
data:p1_file type string.
at selection-screen on value-request for p_file.
CALL FUNCTION 'F4_FILENAME'
EXPORTING
  PROGRAM_NAME        = SYST-CPROG
  DYNPRO_NUMBER       = SYST-DYNNR
  FIELD_NAME          = ' '
IMPORTING
   FILE_NAME           = p_file
start-of-selection.
p1_file = p_file.
CALL FUNCTION 'GUI_UPLOAD'
  EXPORTING
    FILENAME                      = p1_file
   FILETYPE                      = 'ASC'
   HAS_FIELD_SEPARATOR           = '#'
  HEADER_LENGTH                 = 0
  READ_BY_LINE                  = 'X'
  DAT_MODE                      = ' '
  CODEPAGE                      = ' '
  IGNORE_CERR                   = ABAP_TRUE
  REPLACEMENT                   = '#'
  CHECK_BOM                     = ' '
  VIRUS_SCAN_PROFILE            =
  NO_AUTH_CHECK                 = ' '
IMPORTING
  FILELENGTH                    =
  HEADER                        =
  TABLES
    DATA_TAB                      = it_data.
EXCEPTIONS
  FILE_OPEN_ERROR               = 1
  FILE_READ_ERROR               = 2
  NO_BATCH                      = 3
  GUI_REFUSE_FILETRANSFER       = 4
  INVALID_TYPE                  = 5
  NO_AUTHORITY                  = 6
  UNKNOWN_ERROR                 = 7
  BAD_DATA_FORMAT               = 8
  HEADER_NOT_ALLOWED            = 9
  SEPARATOR_NOT_ALLOWED         = 10
  HEADER_TOO_LONG               = 11
  UNKNOWN_DP_ERROR              = 12
  ACCESS_DENIED                 = 13
  DP_OUT_OF_MEMORY              = 14
  DISK_FULL                     = 15
  DP_TIMEOUT                    = 16
  OTHERS                        = 17
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
perform open_group.
loop at it_data.
Refresh bdcdata.
perform pro_data.
endloop.
perform close_group.
form pro_data.
perform bdc_dynpro      using 'SAPLCSDI' '0100'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29N-STLAN'.
perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_field       using 'RC29N-MATNR'
                              it_data-matnr.      "'S_HIFUH2A1A1A1A-02'.
perform bdc_field       using 'RC29N-WERKS'
                              'sm01'.
perform bdc_field       using 'RC29N-STLAN'
                              '1'.
perform bdc_field       using 'RC29N-DATUV'
                              '28.11.2007'.
perform bdc_dynpro      using 'SAPLCSDI' '0150'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29P-POSNR(01)'.
perform bdc_field       using 'BDC_OKCODE'
                              '=SETP'.
perform bdc_dynpro      using 'SAPLCSDI' '0708'.
perform bdc_field       using 'BDC_OKCODE'
                              '=CLWI'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29P-SELID'.
perform bdc_field       using 'RC29P-SELID'
                              'scrap100002'.
perform bdc_dynpro      using 'SAPLCSDI' '0150'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29P-AUSKZ(01)'.
perform bdc_field       using 'BDC_OKCODE'
                              '=FCDL'.
perform bdc_field       using 'RC29P-AUSKZ(01)'
                              'X'.
*if sy-subrc  <> 0.
perform bdc_dynpro      using 'SAPLCSDI' '0150'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29P-POSNR(01)'.
perform bdc_field       using 'BDC_OKCODE'
                              '=FCBU'.
*endif.
perform bdc_transaction using 'CS02'.
endform.

Answer 1

Thanks for the reply sandeep, actually wt happen is by mistake I have uploaded wrong line item  for the material in my first BDC so I have to delete those records that is the line items which were entered wrong.
the fieds of the line items are IDNRK,meng, meins & postp.
I am able to delete the records using the program I have posted but the problem is if that particular line item(which I need to delete) is not available in that material the BDC stuck saying the line item not found or else its deleting some other line item which is not  right .
so I need some help in writing the logic to this BDC so that it only deletes the required line items and if not found it has to go to the next material.
Thanks for your time and appreciate your help