BDC for MB1A - Post Goods Issue

Make the file txt file.
Format in the form of structure defined below in ST.

REPORT ZMB1A NO STANDARD PAGE HEADING LINE-SIZE 255.

"DECLARATION TYPES
DATA: W_FILENAME TYPE STRING.
SELECTION-SCREEN SKIP 1.
SELECTION-SCREEN BEGIN OF BLOCK B1 WITH FRAME TITLE TEXT-500.
PARAMETERS: P_FILENM LIKE RLGRAP-FILENAME.
SELECTION-SCREEN END OF BLOCK B1.

"STRUCTURE
TYPES : BEGIN OF ST,
      BLDAT(10),
      BUDAT(10),
      BWARTWA(3),
      WERKS(4),
      LGORT(4),
      MATNR(18),
      ERFMG(13),
      KONTO(10),
      SGTXT(50),
      KOSTL(10),
  END OF ST.

*INTERNAL TABLE AND WORKAREA DECLARATION*
DATA : IT TYPE TABLE OF ST.
DATA : WA TYPE ST.

INCLUDE BDCRECX1.

START-OF-SELECTION.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILENM.

  CALL FUNCTION 'WS_FILENAME_GET'
       EXPORTING
            MASK             = ',*.*,*.*.'
            MODE             = '0'
            TITLE            = 'GET FILE NAME'
       IMPORTING
            FILENAME         = P_FILENM
       EXCEPTIONS
            INV_WINSYS       = 1
            NO_BATCH         = 2
            SELECTION_CANCEL = 3
            SELECTION_ERROR  = 4
            OTHERS           = 5.

** START OF CHANGE DCS05052003
START-OF-SELECTION.
 W_FILENAME = P_FILENM.
CALL FUNCTION 'GUI_UPLOAD'
  EXPORTING
**   FILENAME                    = 'C:\BDC_XLS_ASSIGN.TXT'
   FILENAME                      = W_FILENAME
   FILETYPE                      = 'ASC'
   HAS_FIELD_SEPARATOR           = 'X'
  TABLES
    DATA_TAB                     = IT
 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 INTO WA.

PERFORM BDC_DYNPRO      USING 'SAPMM07M' '0400'.
PERFORM BDC_FIELD       USING 'BDC_CURSOR'
                              'RM07M-BWARTWA'.
PERFORM BDC_FIELD       USING 'BDC_OKCODE'
                              '=NPE'.
PERFORM BDC_FIELD       USING 'MKPF-BLDAT'
                              WA-BLDAT."'01.04.2016'.
PERFORM BDC_FIELD       USING 'MKPF-BUDAT'
                              WA-BUDAT."'20.07.2016'.
PERFORM BDC_FIELD       USING 'RM07M-BWARTWA'
                              WA-BWARTWA."'201'.
PERFORM BDC_FIELD       USING 'RM07M-WERKS'
                              WA-WERKS."'2000'.
PERFORM BDC_FIELD       USING 'RM07M-LGORT'
                              WA-LGORT."'2009'.
PERFORM BDC_FIELD       USING 'XFULL'
                              'X'.
PERFORM BDC_FIELD       USING 'RM07M-WVERS2'
                              'X'.
PERFORM BDC_DYNPRO      USING 'SAPMM07M' '0410'.
PERFORM BDC_FIELD       USING 'BDC_CURSOR'
                              'MSEG-SGTXT'.
PERFORM BDC_FIELD       USING 'BDC_OKCODE'
                              '=BU'.
PERFORM BDC_FIELD       USING 'MSEG-MATNR'
                              WA-MATNR."'300000011'.
PERFORM BDC_FIELD       USING 'MSEG-ERFMG'
                              WA-ERFMG."'250'.
PERFORM BDC_FIELD       USING 'MSEG-WERKS'
                              WA-WERKS."'2000'.
PERFORM BDC_FIELD       USING 'MSEG-LGORT'
                              WA-LGORT."'2009'.
PERFORM BDC_FIELD       USING 'DM07M-KONTO'
                              WA-KONTO."'650999'.
PERFORM BDC_FIELD       USING 'MSEG-SGTXT'
                              WA-SGTXT."'TEST'.
PERFORM BDC_FIELD       USING 'DKACB-FMORE'
                              'X'.
PERFORM BDC_DYNPRO      USING 'SAPLKACB' '0002'.
PERFORM BDC_FIELD       USING 'BDC_CURSOR'
                              'COBL-AUFNR'.
PERFORM BDC_FIELD       USING 'BDC_OKCODE'
                              '=ENTE'.
PERFORM BDC_FIELD       USING 'COBL-KOSTL'
                              WA-KOSTL."'20000'.
PERFORM BDC_TRANSACTION USING 'MB1A'.

ENDLOOP.

PERFORM CLOSE_GROUP.