Hi DBAlicious,
I already taken a sample test in my visual studio 2008 and visual studio 2012 environment, the result is that the main report displays fine and an error displays on the subreport when we preview the main report. The only difference is that subreport always displays “Error: Subreport could not be shown” in VS 2008, while the subreport displays error message based on the specific exact error in VS 2012. But we can see the detail error message from Error List Window in those two versions.
In your scenario, I think the reason is that there are some errors in the main report, so the entire report displays a processing error. We can directly preview the main report without the subreport to test the main report. Or use the same project in those two versions to test the issue again.
If there are any other questions, please feel free to let me know.
Regards,
Katherine Xiong
Katherine Xiong
TechNet Community Support
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