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I would recommend you to use the features of Schematron in Oracle SOA Suite to achieve this. Schematron can be used for field level validation for an xml message.
You can see a few examples of it in the Oracle Advanced SOA Suite Page
Schematron Validation in Oracle BPEL using Custom XPath Function Aug-2011
You can use Schematron OOTB in a Mediator Component. To use it inside your BPEL project you can leverage the code available in the above blog.