Unknown/Junk Characters in RFC call

Hey All,
I am having a strange issue in one of the RFC calls made from a Java System to our SAP system. We were getting random errors with this interface( the interface was working well before for a long time) . When I Captured the values sent during the RFC calls I found a lot of junk characters being sent by the other system. Is this the problem of the sending sytem or something in between?
Has anyone experienced anything like this before.
Any inputs on what could be the Issue.
Thanks

Ash,
The Java Application is connected to the SAP System using Java Connector.
aRs,
The rfc is basically a wraper of standard Bapi "BAPI_REPMANCONF1_CREATE_MTS" for confirmations which has a IMSEG related structure with a lot of QUAN fields. What do you think is the issue with RFC calls and QUAN fields. Becausing changing all the QUAN's to Chars and converting it back to QUAN in the wrapper will be a decently big change.
I was kindoff ruling out the unicode issue because this interface was working fine for more the 6 months, and we were unicode long time ago.
One thing I suspect where the Issue could be is the SDK kit for the Java application. We recently Updated our Kernel Version and I think we should Upgrade the SDK';s too which was not done. What do you think??
Thanks

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