Cause
This error occurs if you carry out a partial load of an ExternalDatabase with the option to delete classes that are not in the schema file and the deletion of one or more ExternalDatabase classes is not allowed. For example, the class could be used as a reference or in a non-ExternalDatabase collection class.
Action
The classes which cannot be deleted are listed your JADE messages (jommsg.log) log file. Delete the uses of these ExternalDatabase classes and then retry the partial load of the ExternalDatabase.