A few things to check.
1 -what is the link between the 2 reports
2 -are you properly placing the report so that those records are applicable to that section.
3 - make sure it is set to can grow in the main report
Most probable set up based on your descirption is that your main report should be grouping on ProductID, linking to the subreport on this ID and then the subreport being placed on either the ID# headerb or footer.
This way it will run the sub report once per product and display results for each product. Of course I am taking a guess at this as I cannot see your data

Edited by DBlank - 30 Apr 2009 at 7:21am