'Basic tab' setting for content type is not restored after export / import of content type

Hi,

I designed a content type via CCK that contains several groups defined as tabs, and the rest of fields are configured to show up in the 'default' tab which i called 'General'. This works OK, but the problem is, if i export the content type via the 'Admin/Content Types/Export' feature and then import it back, the configuration for the default tab is gone and the content not assigned to any group is shown at the beginning.

Any ideas?

Thanks