Dear Tom,
I've already asked this question to the developpers and the answer is more linked to the database structure and possibility and limitation. Maybe the new Oracle version will allow this to be done (I'm not sure of this point :-(
Anyway, as a workaround, they have added the possibility to create checkbox field which can be useful in the case you describe.
Hope this helps !
Arnaud PAUTY from CARRENET in France
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