FtpAdapter doesn't transfer empty files

Hi there,
I am trying put an empty file (= 0 bytes) to another server via the FtpAdapter, using a SFTP-Connection.
The log doesn't display any error but only the successful transmission, but on the
destination server there is no file written. I've tried to switch from ascii to binary without success. Here's the log:
<File Adapter::Outbound> Successful in setting up the SFTP connection
<File Adapter::Outbound> Managed Connection Created
<File Adapter::Outbound> Adding Event Listener
<File Adapter::Outbound> Creating Connection
<File Adapter::Outbound> Connection Created
<File Adapter::Outbound> Connection manager allocated connection :oracle.tip.adapter.ftp.FTPConnection@ae401b
<File Adapter::Outbound> Creating FTPInteraction
<File Adapter::Outbound> Creating an SFTPSender
<File Adapter::Outbound> SFTP Sender created
<File Adapter::Outbound> FTPInteraction Created
<AdapterFramework::Outbound> Instantiating outbound JCA interactionSpec oracle.tip.adapter.ftp.outbound.FTPInteractionSpec
<AdapterFramework::Outbound> Populating outbound JCA interactionSpec oracle.tip.adapter.ftp.outbound.FTPInteractionSpec with properties: {FileNamingConvention=dummy, OpaqueSchema=true, NumberMessages=1, PhysicalDirectory=/, FileType=binary}
<AdapterFramework::Outbound> file:/u01/app/oracle10g/product/10.1.3.1/OracleAS_1/bpel/domains/default/tmp/.bpel_CpOutput_1.0_0053ad28af82f0120114b2f22390139c.tmp/FtpSendDiva.wsdl [ Put_ptt::Put(opaque) ] - Starting JCA LocalTransaction
<AdapterFramework::Outbound> file:/u01/app/oracle10g/product/10.1.3.1/OracleAS_1/bpel/domains/default/tmp/.bpel_CpOutput_1.0_0053ad28af82f0120114b2f22390139c.tmp/FtpSendDiva.wsdl [ Put_ptt::Put(opaque) ] - Invoking JCA outbound Interaction
<File Adapter::Outbound> FTP outbound adapter interaction invoked : oracle.tip.adapter.ftp.outbound.FTPInteractionSpec@18bdbcf
<File Adapter::Outbound> FTP outbound adapter write file interaction invoked.
<File Adapter::Outbound> File Adapter received an input Record
<File Adapter::Outbound> Waiting outside sync object.....
<File Adapter::Outbound> Considering header for filename, output filename from header: testfile.csv
<File Adapter::Outbound> Not Considering header for directory as it is blank
<File Adapter::Outbound> Inside getUniqueDirectory::InteractionSpec getProcessName for [bpel://localhost/default/CpOutput~1.0/] returned [CpOutput~1.0]
<File Adapter::Outbound> GenUtil::getUniqueDirectory::InteractioSpec [localhost_default_CpOutput~1.0_/FtpSendD//] ==> [CpOutput~1.0/CKlx14IRspFHDdTf6wtdDA==]
<File Adapter::Outbound> MD5 BaseDir is [cut]
<File Adapter::Outbound> Batcher created using staging : true with number of messages : 1
<File Adapter::Outbound> ServerType: unix
<File Adapter::Outbound> Specified ServerType: unix, using unix LineSeparator
<File Adapter::Outbound> Input Record: javax.xml.transform.dom.DOMSource@10c1cdc
<File Adapter::Outbound> Translating....
<File Adapter::Outbound> Outbound Translation done.
<File Adapter::Outbound> Refreshed (staging/num Messages) file count : 1
<File Adapter::Outbound> Wrote to Control File
<File Adapter::Outbound> Batching staging File: staging0
<File Adapter::Outbound> Batcher sending to sender for output file writing
<File Adapter::Outbound> Sending File to output Dir
<File Adapter::Outbound> Obtaining SFTP Agent
<File Adapter::Outbound> Putting file: testfile.csv to: / Append: false
<File Adapter::Outbound> Put file:
<File Adapter::Outbound> Done Writing to output file testfile.csv in dir / !!
<File Adapter::Outbound> End clearing Control File
<File Adapter::Outbound> Deleting staging File: staging0
<File Adapter::Outbound> End clearing Control File
<File Adapter::Outbound> Interaction gets a ok response
<File Adapter::Outbound> Done with Input Record
<AdapterFramework::Outbound> file:/u01/app/oracle10g/product/10.1.3.1/OracleAS_1/bpel/domains/default/tmp/.bpel_CpOutput_1.0_0053ad28af82f0120114b2f22390139c.tmp/FtpSendDiva.wsdl [ Put_ptt::Put(opaque) ] - Committing JCA LocalTransaction
It works when the file is not empty.
It also works, when i transfer the file manually via 'sftp', so the problem is not the sftp-Server.
Any hints how I can transfer empty files?
We're using 10.1.3.1.
TIA, Roman

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FtpAdapter doesn't transfer empty files

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