How can I rerun a delta extraction using RSA3?

Hi,

I'm (obviously) new to working with extractors.  I'm trying to perform a delta run in development using RSA3, but it returns zero records since I already ran the delta extraction in BI and there is no new data.  I deleted the delta InfoPackage from the DataSource in BI, but it still won't let me run the delta using RSA3.

Is there something else I need to do to fully reset the delta so that I can use RSA3?

Thanks for your help!