A good example is - 
how to distinguish between no entered temperature value and 0°



a similar problem exists for Boolean fields - we have
* true
* false
* emtpy

false and empty are displayed identicaly.

I suggest to display "-" for empty 
-- 
regards
Ferdinand Gassauer
ChriCar Beteiligungs- und Beratungs- GmbH
Official OpenERP Partner

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