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When using the Calculate Field tool on a feature class that participates in a join stored in an ArcSDE Enterprise geodatabase, the following error message is returned.
Error: Objects in this class cannot be updated outside of an edit session.
This is a known limitation in ArcGIS 9.2. See NIM034243 for more information.
Start an edit session prior to running the Calculate Field tool. The bug is fixed in ArcGIS 9.3.