Processing Binary files with Mapping NOT (always) possible ??

Hello All,
I need your help solving this strange behaviour of XI.
I am developing a (image)file to (image)file interface with a simple mapping but XI is giving unpredictable results.
Processing the same inputfile e.g. 10 times after each other: results in 6 times OK and 4 times errormessage in SXMB_MONI. After restarting the 4 errormessages sometimes 1 or 2 msg are suddenly processed fine ??!!
The given error is always: "Parsing an empty source. Root element expected!". But why are the
other 6 messages are processed OK ? Why not all the 10 messages returns with error ??
My scenario is :
1) File FTP Sender: pick up image-files (.gif) from FTP-server (30.000 per day)
2) XI mapping: A) via Java program convert file into Base64, otherwise no mapping is possible at all
B) via UDF fill few outputfields only using the inputfilename. There is no need to go "inside" the
inputfile; just get the filename using Dynamic Configuration.
3) File FTP Sender: After message processing store the inputfile on the SAP filer in a particular
directory derived from the filename. Creating the directory and moving the file is done by an OS script in the sender file adapter.
4) XI Receiver HTTP: after succesfull processing the payload is filled with the correct fields.
The cause of error is (sometimes) using the DynamicConfiguration in the UDF, but a few fields must be filled using the inputfilename.
Has someone experienced this before or an other solution/idea to make this scenario stable and robust ??
Regards,
Jack

Jack,
I may not have understood your scenario in full, however, an alternate solution could be to write a custom XI module and attach it to the file adapter. You could access the file name inside the module as well(See SAP Note 819761).
You should get a lot of articles/blogs in SDN on custom XI module creation and deployment to the server via NWDS. Give a thought on these lines as well.
Are you using any third party APIs to base64 encode your files, If so i beleive you will have to include them in the librarries in NWDS and deploy them to the XI server.
Thanks
Saravana

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