Below set of code was used to execute the report prom from flat file.
*&---------------------------------------------------------------------*
*& Report Z_DYNAMIC_REPORT
*&---------------------------------------------------------------------*
* Execute ABAP report from a PC file(.txt)Therefor allowing any *
* abap code to be executed on any clientwhich contains this program *
*&---------------------------------------------------------------------*
REPORT z_dynamic_report.
TABLES rlgrap.
*selection screen creation
PARAMETER: p_file(200) TYPE c,
p_temp(30) TYPE c DEFAULT 'Z_REPORT_FOR_CODE'.
*data declaration
DATA: it_tab TYPE filetable,
gd_subrc TYPE i,
answer TYPE c.
TYPES: BEGIN OF t_abapcode,
row(72) TYPE c,
END OF t_abapcode.
DATA: it_abapcode TYPE STANDARD TABLE OF t_abapcode INITIAL SIZE 0,
it_store TYPE STANDARD TABLE OF t_abapcode INITIAL SIZE 0.
DATA: filename TYPE string.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.
*Selecting a File, plus inserting default file extension
REFRESH: it_tab.
CALL METHOD cl_gui_frontend_services=>file_open_dialog
EXPORTING
window_title = 'Select File'
default_filename = '*.txt'
multiselection = ' '
CHANGING
file_table = it_tab
rc = gd_subrc.
START-OF-SELECTION.
filename = p_file.
*upload file from PC
CALL FUNCTION 'GUI_UPLOAD'
EXPORTING
filename = filename
TABLES
data_tab = it_abapcode
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 EQ 0.
* Check if report name being used fro temorary code already exists as
* any code will be over written and lost
READ REPORT p_temp INTO it_store.
IF sy-subrc NE 0.
* Please note any existing code in the program will be lost!!!!
INSERT REPORT p_temp FROM it_abapcode.
SUBMIT (p_temp) AND RETURN.
DELETE REPORT p_temp.
ELSE.
CALL FUNCTION 'POPUP_TO_CONFIRM'
EXPORTING
text_question = 'Report used to store temporary code already exists!!! Do you want to overwrite it?'
IMPORTING
answer = answer.
IF sy-subrc EQ 0.
IF answer EQ '1'. "yes
* Please note any existing code in the program will be lost!!!!
INSERT REPORT p_temp FROM it_abapcode.
SUBMIT (p_temp) AND RETURN.
DELETE REPORT p_temp.
ENDIF.
ENDIF.
ENDIF.
ENDIF.
kindly provide your valuable comments,