Section 3.4.5 of Web Services Business Process Execution Language Version 2.0 Primer states, that:
<from partnerLink="Supplier"/>
is sufficient.
Well, not in case of Apache ODE...
Know how blog: Java EE, Web Services, WSIT, WS-BPEL, SOA, Spring, Maven2, best practices and testing
<from partnerLink="Supplier"/>
All examples that I have ever used in any post in my blog can be found here:
http://www.mediafire.com/jbs-blog-examples
enjoy!
If you need more examples do not hesitate to contact me or add a comment to post to which you would like me to add an example.