I am having a problem with a copy of my production app. One table is some how dropping out of the DBC. If I open the DBC and modify it the icon for the table is shown but if I try to modi it I get an error to the effect that the table is not marked as belonging to the DBC and do I want to create a backlink. This is what happens in the app, but the user does not have any way of creating the backlink and a cascade of errors then occurs. Any help of how to prevent this and what to do when it does occur? Thanks.