Program showing you the syntax of BDC and call transaction.

REPORT ZSYSTEM LINE-SIZE 255.
TABLES: T100.
* Batch-input data
DATA: BEGIN OF G_BDCDATA OCCURS 100.
        INCLUDE STRUCTURE BDCDATA.
DATA: END OF G_BDCDATA.

DATA: G_MESSAGE(200).

PERFORM FILL_BDCDATA.
CALL TRANSACTION 'FI01'  USING G_BDCDATA  MODE 'N'.
* of course it is nicer with a message itab, but this example
* should also demostrate the use of system variables.
SELECT SINGLE * FROM T100 WHERE
                SPRSL = 'E'
            AND ARBGB = SY-MSGID
            AND MSGNR = SY-MSGNO.
G_MESSAGE = T100-TEXT.

PERFORM REPLACE_PARAMETERS  USING     SY-MSGV1
                                      SY-MSGV2
                                      SY-MSGV3
                                      SY-MSGV4
                            CHANGING  G_MESSAGE.

WRITE: / 'System variables:'.
SKIP.
WRITE: / '        Sy-msgty:', SY-MSGTY.
WRITE: / '        Sy-msgid:', SY-MSGID.
WRITE: / '        Sy-msgno:', SY-MSGNO.
WRITE: / '        Sy-msgv1:', SY-MSGV1.
WRITE: / '        Sy-msgv2:', SY-MSGV2.
WRITE: / '        Sy-msgv3:', SY-MSGV3.
WRITE: / '        Sy-msgv4:', SY-MSGV4.
SKIP.
WRITE: / 'The transaction was called with a wrong country code.'.
WRITE: / 'The error message should be either that or that you have'.
WRITE: / '  no authorisation to execute the transaction'.
SKIP.
WRITE: / 'Message:'.
SKIP.
WRITE: / SY-MSGTY, G_MESSAGE.

*---------------------------------------------------------------------*
*       Build up the BDC-table                                        *
*---------------------------------------------------------------------*
FORM FILL_BDCDATA.
  REFRESH G_BDCDATA.

  PERFORM BDC_DYNPRO USING 'SAPMF02B' '0100'.
  PERFORM BDC_FIELD USING 'BNKA-BANKS' 'ZZZ'.
  PERFORM BDC_FIELD USING 'BDC_OKCODE' 'QQQQQ'.

ENDFORM.

*---------------------------------------------------------------------*
*       FORM BDC_DYNPRO                                               *
*---------------------------------------------------------------------*
*       Batchinput: Start new Dynpro                                  *
*---------------------------------------------------------------------*
FORM BDC_DYNPRO USING P_PROGRAM P_DYNPRO.
  CLEAR G_BDCDATA.
  G_BDCDATA-PROGRAM = P_PROGRAM.
  G_BDCDATA-DYNPRO = P_DYNPRO.
  G_BDCDATA-DYNBEGIN = 'X'.
  APPEND G_BDCDATA.
ENDFORM.                               " BDC_DYNPRO

*---------------------------------------------------------------------*
*       FORM BDC_FIELD                                                *
*---------------------------------------------------------------------*
*       Batchinput: Feld hinzufugen                                   *
*---------------------------------------------------------------------*
FORM BDC_FIELD USING P_FNAM P_FVAL.
  CLEAR G_BDCDATA.
  G_BDCDATA-FNAM = P_FNAM.
  G_BDCDATA-FVAL = P_FVAL.
  APPEND G_BDCDATA.
ENDFORM.                               " BDC_FIELD
*---------------------------------------------------------------------*
*       FORM REPLACE_PARAMETERS                                       *
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
*  -->  P_PAR_1                                                       *
*  -->  P_PAR_2                                                       *
*  -->  P_PAR_3                                                       *
*  -->  P_PAR_4                                                       *
*  -->  P_MESSAGE                                                     *
*---------------------------------------------------------------------*
FORM REPLACE_PARAMETERS  USING    P_PAR_1
                                  P_PAR_2
                                  P_PAR_3
                                  P_PAR_4
                         CHANGING P_MESSAGE.

* erst mal pruefen, ob numerierte Parameter verwendet wurden
  DO.
    REPLACE '&1' WITH P_PAR_1 INTO P_MESSAGE.
    IF SY-SUBRC <> 0.
      EXIT.
    ENDIF.
  ENDDO.
  DO.
    REPLACE '&2' WITH P_PAR_2 INTO P_MESSAGE.
    IF SY-SUBRC <> 0.
      EXIT.
    ENDIF.
  ENDDO.
  DO.
    REPLACE '&3' WITH P_PAR_3 INTO P_MESSAGE.
    IF SY-SUBRC <> 0.
      EXIT.
    ENDIF.
  ENDDO.
  DO.
    REPLACE '&4' WITH P_PAR_4 INTO P_MESSAGE.
    IF SY-SUBRC <> 0.
      EXIT.
    ENDIF.
  ENDDO.
* falls keine numerierten Parameter vorh., ersetzen wie gehabt
  REPLACE '&' WITH P_PAR_1 INTO P_MESSAGE.
  CONDENSE P_MESSAGE.
  IF SY-SUBRC EQ 0.
    REPLACE '&' WITH P_PAR_2 INTO P_MESSAGE.
    CONDENSE P_MESSAGE.
    IF SY-SUBRC EQ 0.
      REPLACE '&' WITH P_PAR_3 INTO P_MESSAGE.
      CONDENSE P_MESSAGE.
      IF SY-SUBRC EQ 0.
        REPLACE '&' WITH P_PAR_4 INTO P_MESSAGE.
        CONDENSE P_MESSAGE.
      ENDIF.
    ENDIF.
  ENDIF.

ENDFORM.                               "replace_parameters