Trigger File Generation to a Server from Web Dynpro Application

Hi Everybody! Hope you had a good new years eve
Is it possible to generate a File on a Server outgoing from Web Dynpro?
I tried to use GUI_DOWNLOAD. But as I couldn't use the GUI_DOWNLOAD from the Web Dynpro, I wrote a Report "ZCMI_EXPORT_FILE" that generates a Text-File. When I start the Report by myself, the file gets generated. All fine.
To be able to generate the File from Web Dynpro, I created a Batch Input Function Module, that I call in the Web Dynpro. The File is not created and it does not show any errors.
Do you have any idea how i can get this working? I'd also be happy with a different approach.
Best Regards and Thanks,
Steffen
REPORT that is called with Batch Input from Web Dynpro:
call function 'ZFM_GENERATE_EXPORT'
exporting
 it_detail_record = lt_records
 is_export = gs_export
importing
 ev_string = gs_export-document
 et_dataset = data_tab
exceptions
 parameter_is_initial = 1
 others = 2.
if sy-subrc <> 0.
endif.
concatenate '\\SERVER\EXPORT\' gs_export-filename into lv_filename.
call function 'GUI_DOWNLOAD'
exporting
 filename = lv_filename
tables
 data_tab = data_tab
exceptions
 file_write_error = 1
 no_batch = 2
 gui_refuse_filetransfer = 3
 invalid_type = 4
 others = 5.
if sy-subrc <> 0.
exit.
endif.

HI,
GUI_DOWNLOAD does not get's executed in the Backgroud.
there is no way to do it as a background job.. create the folder.. transfer the file to the application server in the backgorund using OPEN DATASET... use the tcode CG3Y to download the file from the app server to your folder..

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