SS2K8 R2 SP2 RS Report Builder 3 data extension not installed or cannot be loaded

Hi, the following error:

The selected data extension <data extension name> is not installed or cannot be loaded. Verify that the selected data extension is installed on the client for local reports and on the report server for published reports. (Microsoft.ReportingServices.Designer.Controls)

is not resolved by

http://support.microsoft.com/kb/981881?wa=wsignin1.0

which refers to Report Builder 2.0 - we are using 3.0

applying SS2K8 R2 SP2 to both server and client.

I would be most grateful for any advice.

Regards - Martin

Martin Peter Clarke