>>Once you select the BO as the datasource, do you see the BO props in the data sources window under the BO object when you expand the BO >object? Usually you can just click on the property in the datasource window and drag it over to the report...
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>Yes I see all the propertyes and I can drag it... but no data is displayed... the problem is that Field values are in a subclass of the BO eg. Field!Entity.LastName.Value so Field!LastName.value does not work, but I tryed both and got nothing displayed... just empty space...

I've never seen a design like that. I'm not sure I understand how your entity classes are designed now that you mention the field values are in a subclass of the bo. Can you post an example of a simple BO and the subclass? Can you add the subclass as the datasource and use it mayble? Perhaps I'm just not picturing your design correctly...

Also, please post the code where you populate a dataset or a list or something with the entity's actual values at runtime (it must match the entity design) prior to running the report.