SSRS is in SharePoint integrated mode.
A simple Report with a sub report in it loads fine. When the sub report is moved to it's own folder, the main report fails to save/load. The folder exists at the same level as the main report.
The error reads like
System.Web.Services.Protocols.SoapException: The ReportName for the subreport ‘Subreport1’ is not valid. Item names cannot contain the following reserved characters ;?:@&=+$,*<>|".
at Microsoft.ReportingServices blah blah......
Let me know if anyone has deployed sub-report in a separate folder while on a SharePoint integrated mode.