Hi James Harkins,
Unfortunately the OpenAccessDataSource does not support querying the database directly. There is no way to use a stored procedure to get values for the data source. You can either use default behavior and let the data source query the database or use the Command Text property of the data source to specify the OQL query used to retrieve the result set.
You can find more information on the command text property in this help article. While this might not be the solution you are looking for, the OQL query that you can build can be quite complex and replace the stored procedure. You can find more information on OQL here.
I do hope this helps.
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