Question related to BDC for XD01

Question

I created a bdc program from the sample recording which I did using xd01. Basically, I am trying to transfer customer records from a text file on my computer to sap using xd01.
The bdc_data text file which I use in the below code contains data of the form:
0005     5120000004     samplename     samplesearch     chicago      60606     us     en
(all are separated by tabs)
I am also attaching the code below. I executed the program and created session, then went to sm35, chose the session and F8 in 'display error' mode. Then I am getting a message for XD01 transaction as #5120000004#SAMP in customer field and error message 'Account number incorrect. please check the entry'. Am I doing anything wrong with the way I wrote those customer records in the text file using tabs? Please help. Thanks.
The code is below:
REPORT Z_XD01_AUGPROGRAM
       NO STANDARD PAGE HEADING LINE-SIZE 255.
TABLES: KNA1.
INCLUDE BDCRECX1.
DATA: BEGIN OF BDC_DATA OCCURS 0.
        INCLUDE STRUCTURE BDCDATA.
DATA: END OF BDC_DATA.
DATA:
BEGIN OF ITAB OCCURS 0,
      KTOKD LIKE RF02D-KTOKD,
     KUNNR LIKE RF02D-KUNNR,
     NAME1 LIKE KNA1-NAME1,
       SORTL LIKE KNA1-SORTL,
     ORT01 LIKE KNA1-ORT01,
       PSTLZ LIKE KNA1-PSTLZ,
       LAND1 LIKE KNA1-LAND1,
     SPRAS LIKE KNA1-SPRAS,
END OF ITAB.
START-OF-SELECTION.
  CLEAR BDC_DATA.
  REFRESH BDC_DATA.
  PERFORM LOAD_DATA USING 'C:\BDC\BDC_DATA.TXT'.
  PERFORM OPEN_GROUP.
  LOOP AT ITAB.
    PERFORM BDC_DYNPRO      USING 'SAPMF02D' '0100'.
    PERFORM BDC_FIELD       USING 'BDC_CURSOR'
                                  'RF02D-KTOKD'.
    PERFORM BDC_FIELD       USING 'BDC_OKCODE'
                                  '/00'.
    PERFORM BDC_FIELD       USING 'RF02D-KTOKD'
                                   ITAB-KTOKD.
    PERFORM BDC_FIELD       USING 'RF02D-KUNNR'
                                  ITAB-KUNNR.
    PERFORM BDC_DYNPRO      USING 'SAPMF02D' '0110'.
    PERFORM BDC_FIELD       USING 'BDC_CURSOR'
                                  'KNA1-SPRAS'.
    PERFORM BDC_FIELD       USING 'BDC_OKCODE'
                                  '/00'.
    PERFORM BDC_FIELD       USING 'KNA1-NAME1'
                                  ITAB-NAME1.
    PERFORM BDC_FIELD       USING 'KNA1-SORTL'
                                  ITAB-SORTL.
    PERFORM BDC_FIELD       USING 'KNA1-ORT01'
                                  ITAB-ORT01.
    PERFORM BDC_FIELD       USING 'KNA1-PSTLZ'
                                  ITAB-PSTLZ.
    PERFORM BDC_FIELD       USING 'KNA1-LAND1'
                                  ITAB-LAND1.
    PERFORM BDC_FIELD       USING 'KNA1-SPRAS'
                                  ITAB-SPRAS.
    PERFORM BDC_DYNPRO      USING 'SAPMF02D' '0120'.
    PERFORM BDC_FIELD       USING 'BDC_CURSOR'
                                  'KNA1-TXJCD'.
    PERFORM BDC_FIELD       USING 'BDC_OKCODE'
                                  '=UPDA'.
    PERFORM BDC_TRANSACTION USING 'XD01'.
  ENDLOOP.
  PERFORM CLOSE_GROUP.
*&      Form  load_data
      text
     -->P_0076   text
FORM LOAD_DATA  USING    VALUE(P_0076).
  CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      FILENAME                      = 'C:\BDC\BDC_DATA.TXT'
     FILETYPE                       = 'ASC'
  HAS_FIELD_SEPARATOR           = ' '
  HEADER_LENGTH                 = 0
  READ_BY_LINE                  = 'X'
  DAT_MODE                      = ' '
  CODEPAGE                      = ' '
  IGNORE_CERR                   = ABAP_TRUE
  REPLACEMENT                   = '#'
  CHECK_BOM                     = ' '
IMPORTING
  FILELENGTH                    =
  HEADER                        =
    TABLES
      DATA_TAB                      = ITAB
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.
ENDFORM.                    " load_data

Answer 1

It is working out pretty well with Anil's suggestion but still there is a minor problem. While transferring records, for each record, it is showing error message just for language (spras) field (remaining all fields are getting updated correctly). The value in the language field says 'e' (even though in the text file it is written correctly as 'en').
Any idea why it is showing error like this even though it is written well in text file?
Yes, srinivas. I seperated each reading in the text file columnwise by tabs and new records come in a different row.
Thanks for your input.