Documentum eRoom 7.4.4 SP1
This exception might come up because the database might have had an attachment box on the summary page, an attachment was added to it, and then the attachment box was turned off.
Edit the database > summary page options > check the box for "Include box for attachments". If we remove the attachment(s) in this box, we can then turn it back off, and the CERException will stop.
EMC Support Solution Number: 196296