Am I missing something regarding database queries from BPEL?

Hi,
I'm trying to execute what I would think is a simple query from within a BPEL process against an Oracle 10g database.
I have a root table, meter_reading that has an id, a time, a value, and a foreign key to a meter_reading_type table with a simple id-name-description format.
How do I create a PartnerLink in BPEL that queries for the last reading of a particular type? The SQL is easy. The problem is that with the relationship, I can't find the proper format for a pass-through query so that I can do the subselect AND the select by type (name column).
Also, is it possible with the BPEL PM/OC4J combination to output the queries being generated from Toplink?
I've looked through the toplink docs, but they seem to refer to doing this in Java, not in the toplink_mappings.xml file.
Any help would be appreciated. If I'm missing something obvious, please point it out.
Thanks for your time,
Chris

I am guessing from the examples and from looking around that the only solution to this complexity is stored procs and functions. What happens if you're not allowed to use them? Seems like an awkward part of a product that is owned by Oracle.
C

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