Even if this question was posted a long time ago:
Now and then this error occurs in my projects, too.
Every time I try to edit specific elements in Enterprise Architect projects i get exactly the same error messages. The only solution to this is to delete the element completely and create it again.
@TomO:
When you are importing a package, is this from XMI or are you import a source code directory?
I import only via XMI file.
What are you using as a repository?
I'm using a PostgreSQL-Server based repository, which I access via ODBC Driver.
In your ODBC Data Source Configuration do you have "Return matched rows instead of affected rows" and "Allow big result sets".
Could specify where I can find these options? Perhaps this is outdated, becaus I can't find any of these options under the Options/Datasource Menu in my ODBC driver.
If you are importing form XMI are you stripping the GUIDs on import, this is always a good idea if you are making a copy of an existing folder in your model as having two elements with the same GUID is not ideal ;-)
I strip GUIDs when I'm exporting and again when I'm importing XMI files.
I would really apprechiate any help concerning this topic.