this used to be possible.
what happens when an older structure with a self referential relation is 
upgraded?

>>  how do I draw a self-referential relation?
> You cannot make a single field both the primary and foreign keys of a 
> relation. You must choose two different fields.
> For example, you can make [Table_1]Field1 related to [Table_1]field2
> Reminder: the fields must be compatible with each other as you would 
> not be able to relate a longint field to an alpha field...
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     Jean-Paul Sartre
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