After creating a subrealm of the top-level realm and adding the Session Service to it, a subsequent attempt to remove the Session Service configuration caused an error message.
Workaround: Remove the default top-level ID repository, AMSDK1, and then add this repository back into the configuration.
This problem is fixed in patch 1. See Access Manager 7 2005Q4 Patch 1 for information about applying the patch for your specific platform.