Apprenda currently only supports RIA Applications at the Interface level. This is because RIA Services are configured to be IIS Hosted, and as a result, Apprenda cannot host them in its Service Container. It is important to note that you cant have multiple copies of an IIS Hosted Services in the same machine.
When creating an Apprenda Archive using the Archive Builder, one must specify all RIA Services as Interfaces instead of Services. The Platform will then understand that this is a web application and therefore host it in IIS.
Attached is an example of a RIA Application that is supported by the platform. This is an adaptation of a Microsoft application configured to run on Apprenda. (http://code.msdn.microsoft.com/Sample-Classifieds-e45e4911)