If you need to select a filename from the server, function module /SAPDMC/LSM_F4_SERVER_FILE can be used. It's output looks a bit outdated (output composed with WRITEstatements) but it does the trick nicely. Considering that this is not a common user matter (chosing files at the back end shouldn't be) here's an example using a class:

CLASS lcl_f4_processing DEFINITION.
  PUBLIC SECTION.
    CLASS-METHODS:
      f4_server_file CHANGING filepath TYPE any.
ENDCLASS.                    "lcl_f4_processing DEFINITION

CLASS lcl_f4_processing IMPLEMENTATION.
  METHOD f4_server_file.
    DATA: lv_old_filepath TYPE string.

    lv_old_filepath = filepath.

    CALL FUNCTION '/SAPDMC/LSM_F4_SERVER_FILE'
      EXPORTING
        directory        = filepath
        filemask         = ' '
      IMPORTING
        serverfile       = filepath
      EXCEPTIONS
        canceled_by_user = 1
        OTHERS           = 2.
    CASE sy-subrc.
      WHEN 1.
        filepath = lv_old_filepath.
      WHEN 2.
        MESSAGE 'Server file open error' TYPE 'E'.
    ENDCASE.

  ENDMETHOD.                    "f4_server_file
ENDCLASS.

To implement this on a typical selection screen parameter field, follow this example:

PARAMETERS: pa_file2 TYPE c LENGTH 100 
  LOWER CASE VISIBLE LENGTH 56.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR pa_file2.
  lcl_f4_processing=>f4_server_file(
    CHANGING filepath = pa_file2 ).

Alternatively

Do consider the CL_RSAN_UT_FILES=>F4 method. It caters for server file selection too.

Or what about function module F4_DXFILENAME_TOPRECURSION, which even requests whether a file is to be picked up from the presentation server or the backend (application server).

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