I have 2 reports that work just fine from VS, as well as from SSRS report manager.
Thank you for inquiry.
Could you please tell which version of Aspose.BarCode for Reporting Services, Windows OS (x86/x64) and MS SQL Server are you using? I could not reproduce the issue with dataset based reports at my end.
However, I remember we had such an issue with dataset based reported around 2 years ago, which was resolved.
I downloaded the latest release to attempt to fix the problem, v 2.5.0.
The server is running 2008 R2 Standard, and SQL 2008 R2 x64.
They are dataset based reports linked to a SP.
The subscription generated 183 pdf files, it seems like the smaller reports are more often than not missing the Barcodes while the bigger ones have them.