POJO Subreport Linking Problem w/ CR XI

I am having issues linking a POJO sourced subreport into a linked-table-based main report. Both reports run fine alone, and in fact, when I include the subreport in the main report with no link, I can get all of the data. However, when I link the subreport via the subreport links dialog, the result is that I get the correct linking on the first page (i.e., with the first record of the main report), but every other main report record comes up with an empty subreport, even though I know there is matching data values. As I said earlier, without a link between the reports, I can get the whole subreport to produce, and in fact, once for every main report record. I assume that I am missing something in the linking of the main report to the subreport.

Any assistance is greatly appreciated.