This might mean you set an order to your table in the report designer wizard, that creates an index key. This key may conflict with with the the actual order of the table. Check the dataenvironment of the report and try removing the table that is in there.

>I'm working with a very simple report. When in design mode I select Preview I'm getting a Program Error, "The specified Key already exists. This is error 2062. When I first preview the report I don't get the error, but on any subsequent previews the error occurs. I can't imagine anything is wrong in the report, because it is so simple. It must be something in ReportPreview.app. Do you have any suggestions?