I would like to add a feature class to the topology of a featureDataset in ArcSDE (version 10) that was registered as versioned. I disabled archiving and unregistered the featureDataset as versioned. I tried to run the "Add featureclass to topology" tool, but get the error "Cannot add a class that is registered as versioned to a topology". (The feature class and the topology are both in the featureDataset which I just unregistered as versioned)

Thanks for any insight,
Sebastian Roberts