Function to read Excel file

  CALL FUNCTION 'ALSM_EXCEL_TO_INTERNAL_TABLE'
    EXPORTING
      filename                = lw_file " Like : FILE://C:/Users/name/file.xls
      i_begin_col             = lw_first_col
      i_begin_row             = lw_first_row
      i_end_col               = lw_end_col
      i_end_row               = lw_end_row " set big value id end line is not known
    TABLES
      intern                  = it_excel_table
    EXCEPTIONS
      inconsistent_parameters = 1
      upload_ole              = 2
      OTHERS                  = 3.

  IF sy-subrc <> 0.
    " Handle error
  ENDIF.