in menu Administration --> System Initialization --> General Settings --> Display, you can define standard unit of measure for lengths and weights.
It's very useful for my addon, but I'd need standard unit of measure for volume too, because I have to know how to display volumes to the user. Usually it doesn't correspond to the length u.o.m.. Eg: user wants lengths in cm and volumes in m3 (not in cm3!).
Is this setting placed in a different place or how can I overcome this lack? Thanks!