>I'm getting "Relation Broken" when closing a form, followed by an error on a line that's trying to do

Select someCursor

>Am I to understand that the error occurred on the line where the relation was broken, or could the relation just have been broker earlier?

You could just remove relations before closing the form, so then they can't be broken if they don't exist. Just loop through aused(), and issue a Set Relation To for each alias.