Ah, since XI does not support SQL Server R2 you don't have much to work with...
All I can say is try it in .NET and CR 2013 and Native 10 client and if it works there you know the answer... IF it doesn't work then look at Profiler to see what the SQL is being sent by CR and for current versions you can enable CRLogger, search and you'll find the KBA on how to enable it. We don't have one for XI though.
Don