Well...I've got it working. I've just binded the periodsTable Datasource to =Fields.ProductPricePeriods and ive got it working.
Now, the only thing thats bugging me is why in preview mode, html preview mode or online in a ReportViewer, the first element of the subreport is always blank but when I export to PDF, its there! See the attached screenshot and PDF.
Most likely you have set the DataSource to the definition table item, when it should be set to the processing object instead when in the context of event. More information on definition vs. processing is available in our documentation: Understanding Report Items.
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