How do you create a self referential relation?
in older versions you could drag the relational arrow back to the same 
field to get a 'loop'

This does not work now, and I tried to modify the system tables but 
these are locked, and I can not get them to unlock.

2 questions:
-  how do I draw a self referential relation?
-  how do I modify the system tables?

Thanks
Chip

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