parameters: p_infile like ibipparms-path default 'C:\'.

* Executes the pull-down to search C:\ drive for input file 
at selection-screen on value-request for p_infile. 
  call function 'F4_FILENAME'          "allows user to select path/file 
       exporting 
            program_name  = syst-repid 
            dynpro_number = syst-dynnr 
            field_name    = 'p_infile' 
       importing 
            file_name     = p_infile. 
  if sy-subrc ne 0. 
    write: / 'Error'. 
  endif.

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