Validation for BDC program

hi,
In BDC programe I have to check (or) validate the file path at selection screen events .
if the selected file is wrong error message should be triggered. how i can do this.
with regards,
Srinath

Hello Reddy,
In the following example,
purchase order fields are taken in through a text-file, if the fields do not match the fields of internal table, then just throw an error in GUI_UPLOAD saying , 'FILE CANNOT BE UPLOADED' or say 'UPLOADING FAILED'.
* STRUCTURE FOR PURCHASE ORDER TABLE *
TYPES:
BEGIN OF type_s_mat,
 eeind TYPE rm06b-eeind, " Delivery Date
 txz01 TYPE eban-txz01, " Short Text
 menge TYPE eban-menge, " Quantity
 meins TYPE eban-meins, " Units
 preis TYPE eban-preis, " Price
END OF type_s_mat. " BEGIN OF TYPE_S_MAT
* FIELD STRING FOR PURCHASE ORDER TABLE *
DATA:
fs_mat TYPE type_s_mat.
* INTERNAL TABLE FOR PURCHASE ORDER TABLE *
DATA:
 t_mat LIKE
STANDARD TABLE
 OF fs_mat.
* INTERNAL TABLE FOR BATCH DATA TRANSFER *
DATA:
 t_bdc TYPE
STANDARD TABLE
 OF bdcdata
 WITH HEADER LINE.
* INTERNAL TABLE FOR MESSAGES *
DATA:
t_messages TYPE
STANDARD TABLE
 OF bdcmsgcoll
 WITH HEADER LINE.
* Work Variables *
DATA:
w_filename TYPE rlgrap-filename, " Selected File-Name
w_msg(72) TYPE c, " Messages
w_filename1 TYPE string. " Full-Path
* INITIALIZATION *
INITIALIZATION.
PARAMETERS p_file(128). " Name of File to be opened
* AT SELECTION-SCREEN ON VALUE-REQUEST *
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.
PERFORM open_mat_file.
p_file = w_filename.
* START-OF-SELECTION *
START-OF-SELECTION.
IF p_file IS INITIAL.
 MESSAGE 'No File Selected' TYPE 'S' DISPLAY LIKE 'E'.
ELSE.
 PERFORM open_file.
ENDIF. " IF P_FILE IS INITIAL
*& Form open_mat_file
* This Subroutine opens Material File of the Presentation Server.
* This Subroutine has got no Interface Parameters.
FORM open_mat_file .
CALL FUNCTION 'F4_FILENAME'
* EXPORTING
* PROGRAM_NAME = SYST-CPROG
* DYNPRO_NUMBER = SYST-DYNNR
* FIELD_NAME = ' '
 IMPORTING
 file_name = w_filename.
ENDFORM. " FORM OPEN_MAT_FILE
*& Form open_file
* This Subroutine facilitates file upload on Presentation Server.
* This Subroutine has got no Interface Parameters.
FORM open_file .
w_filename1 = w_filename.
CALL FUNCTION 'GUI_UPLOAD'
 EXPORTING
 filename = w_filename1
 filetype = 'ASC'
* has_field_separator = ' '
* HEADER_LENGTH = 0
* READ_BY_LINE = 'X'
* DAT_MODE = ' '
* CODEPAGE = ' '
* IGNORE_CERR = ABAP_TRUE
* REPLACEMENT = '#'
* IMPORTING
* FILELENGTH =
* HEADER =
 TABLES
 data_tab = t_mat
 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 'Uploading Failed' TYPE 'S' DISPLAY LIKE 'E'.
ELSE.
 PERFORM populating_bdc.
ENDIF. " IF SY-SUBRC NE 0
ENDFORM. " FORM OPEN_FILE
*& Form populating_bdc
* This Subroutine Populates data in Transaction ME51
* This Subroutine has got no Interface Parameters.
FORM populating_bdc .
LOOP AT t_mat INTO fs_mat.
 PERFORM screens USING 'SAPMM06B' '0100'.
 PERFORM fields USING 'EBAN-BSART' 'NB'.
 PERFORM fields USING 'EBAN-KNTTP' 'X'.
 PERFORM fields USING 'RM06B-LPEIN' 'T'.
 PERFORM fields USING 'RM06B-EEIND' fs_mat-eeind.
 PERFORM fields USING 'EBAN-WERKS' '1000'.
 PERFORM fields USING 'EBAN-EKGRP' '100'.
 PERFORM fields USING 'EBAN-MATKL' '006'.
 PERFORM fields USING 'BDC_OKCODE' '/00'.
 PERFORM screens USING 'SAPMM06B' '0106'.
 PERFORM fields USING 'EBAN-TXZ01' fs_mat-txz01.
 PERFORM fields USING 'EBAN-MENGE' fs_mat-menge.
 PERFORM fields USING 'EBAN-MEINS' fs_mat-meins.
 PERFORM fields USING 'BDC_OKCODE' '/00'.
 PERFORM screens USING 'SAPMM06B' '0102'.
 PERFORM fields USING 'EBAN-PREIS' fs_mat-preis.
 PERFORM fields USING 'BDC_OKCODE' '/00'.
 PERFORM screens USING 'SAPMM06B' '0505'.
 PERFORM fields USING 'COBL-KOSTL' '1000'.
 PERFORM fields USING 'BDC_OKCODE' '/00'.
 PERFORM screens USING 'SAPMM06B' '0106'.
 PERFORM fields USING 'BDC_OKCODE' 'BU'.
 CALL TRANSACTION 'ME51' USING t_bdc MODE 'A' MESSAGES INTO
 t_messages.
 IF sy-subrc EQ 0.
 LOOP AT t_messages.
 CALL FUNCTION 'FORMAT_MESSAGE'
 EXPORTING
 id = t_messages-msgid
 lang = sy-langu
 no = t_messages-msgnr
 v1 = t_messages-msgv1
 v2 = t_messages-msgv2
 v3 = t_messages-msgv3
 v4 = t_messages-msgv4
 IMPORTING
 msg = w_msg
 EXCEPTIONS
 not_found = 1
 OTHERS = 2.
 IF sy-subrc <> 0.
 MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
 WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
 ELSE.
 WRITE:/ w_msg.
 ENDIF. " IF SY-SUBRC <> 0
 ENDLOOP. " LOOP AT T_MAT INTO FS_MAT
 ENDIF. " IF SY-SUBRC EQ 0
ENDLOOP. " LOOP T_MAT INTO FS_MAT
ENDFORM. " FORM POPULATING_BDC
*& Form screens
* This Subroutine populates program name and screen numbers.
* -->VALUE(P_PROG) PROGRAM NAME
* -->VALUE(P_SCRNO) SCREEN NUMBER
FORM screens USING value(p_prog) value(p_scrno).
t_bdc-program = p_prog.
t_bdc-dynpro = p_scrno.
t_bdc-dynbegin = 'X'.
APPEND t_bdc.
ENDFORM. " FORM SCREENS
*& Form fields
* This Subroutine populates Field Value and Field name
* -->VALUE(P_FNAM) Field Name
* -->VALUE(P_FVAL) Field Value
FORM fields USING value(p_fnam) value(p_fval).
t_bdc-fnam = p_fnam.
t_bdc-fval = p_fval.
APPEND t_bdc.
ENDFORM. " FORM FIELDS
Hope the above given example, helps you.
Thanks: Zahackson

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<removed_by_moderator>
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EXPORTING
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 End-of-selection *
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 Start new screen
 -->P_FNAM text
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 -->P_FVAL text
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<REMOVED BY MODERATOR>
Edited by: Alvaro Tejada Galindo on Apr 14, 2008 6:20 PM

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If your Team Lead given Functional Specifications for a BDC program and you

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Hi Krishna,
See this you will got some ideas.
Diff b/w call transaction and session method is
Call transaction.
1) asynchronous processing
2) can transfer small amount of data
3) processing is faster.
4) errors need to be handled explicitly
5) data is updated automatically
Session method.
1) synchronous processing.
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3) processing is slower.
4) error log is created
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Thanks,
Reward If Helpful.

You are given functional specs for a BDC program

You are given functional specs for a BDC program
and you need to decide whether to write a method
call transaction or a session. How u will decide?
plz explain clearly

depends of type of erro handling required and amount of data to be transfered, we can decide which is best method.
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sessin method - errohandling is there, locking mechanism is there.
for large amount of data , we should go for session method. for faster data transfer we can go for call transaction

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