This project is licenced under Microsoft Public License (MS-PL).

It includes a class (RdlDowngradeEngine) that does all the heavy lifting of downgrading a report.

There is a sample Windows Forms application that you can use (or extend) to downgrade reports and display warnings / errors.

There is also a Report Server projet that contains reports with R2 elements in it so that you can experiment with the downgrade.

Most of the documentation is in french (see blog posts below). You can use Google Translate or better yet, learn french! ;-)

Frederick Samson

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Comment BIDS R2 peut déployer vers Reporting Services 2008 R1 et R2
http://samsonfr.wordpress.com/2012/12/27/comment-bids-r2-peut-dployer-vers-reporting-services-2008-r1-et-r2/

Détails sur le comportement de BIDS R2 lorsque la cible de la configuration est Reporting Services 2008 R1
http://samsonfr.wordpress.com/2012/12/31/dtails-sur-le-comportement-de-bids-r2-lorsque-la-cible-de-la-configuration-est-reporting-services-2008-r1/

Code C# pour convertir un rapport SSRS 2008 R2 en format SSRS 2008 R1