Error during parsing the SOAP part --- Can't parse the document

Hi,

Our system in san nw PO . Scenario is SAP PI webservice to RFC.  SAP PI webservice can be triggered  successfully via SOAPUI. But while sending   with PL/SQL, error occured.

Error during parsing the SOAP part --- Can't parse the document

Caught an Exception: com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 2 of 2-byte UTF-8 sequence

I can not  see any log in soap sender adapter and soa monitoring. Error displays only in Log viewer.

PL/SQL sends  WE8 ISO8859P9  encoding code. This data cannot come to soap adapter. I cannot see any content.  How can i monitor payload of sending  data?

Thanks

Nurhan