Reading Text File from selection Screen and populating table (Urgent)

Hi All,
I have some requirment like i in my report i have to initial my Input feild from text file is it good to populate a internal table or range.
I have three feild in a excel file that entry can more then 500
data example
Matnr Date             Day
A1     10.07.2007    12
B1     10.07.2007    10
A1     19.07.2007    15
C1     20.08.2007    30
E1     11.09.2007    12
This report for Price Protection claim.
even u can help me out with proper table plz this is urgent.

Hi..
parameters:
p_file(50) type c.
data:
begin of itab occurs 0,
 matnr type vbak-matnr,
 date type sy-datum,
 day(2) type n,
end of itab.
at selection-screen on value-request for p_fname.
perform get_path.
start-of-selection.
CALL FUNCTION 'GUI_UPLOAD'
EXPORTING
 FILENAME = p_fname
 FILETYPE = 'ASC'
 HAS_FIELD_SEPARATOR = 'X'
HEADER_LENGTH = 0
READ_BY_LINE = 'X'
DAT_MODE = ' '
CODEPAGE = ' '
IGNORE_CERR = ABAP_TRUE
REPLACEMENT = '#'
CHECK_BOM = ' '
VIRUS_SCAN_PROFILE =
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.
This Sub routine is used to get the file name
*There are no interface parameters passed to this subroutine.
FORM get_path .
CALL FUNCTION 'WS_FILENAME_GET'
EXPORTING
 DEF_FILENAME = P_FNAME
DEF_PATH = ' '
MASK = ' '
MODE = ' '
TITLE = ' '
IMPORTING
 FILENAME = P_FNAME
RC =
EXCEPTIONS
 INV_WINSYS = 1
 NO_BATCH = 2
 SELECTION_CANCEL = 3
 SELECTION_ERROR = 4
 OTHERS = 5
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. " get_path
data:

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Message was edited by:
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