I'm no expert in this transaction but it sound like to me that the procedure you describe is for download to a local file "In Transaction F110 - Environment - Payment Medium - DME Administration - then selection of row and Download" which is why it's giving an error when you put a server path in and that rather than selecting download you should be selecting print/output which would read the settings in OBPM4 which are set to output to file on the application server.
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