Из XML-файла OpenERP:
<group colspan="2" col="2" groups="base.group_extended">
<separator string="Weights" colspan="2"/>
<field digits="(14, 3)" name="volume" attrs="{'readonly':[('type','=','service')]}"/>
<field digits="(14, 3)" name="weight" attrs="{'readonly':[('type','=','service')]}"/>
<field digits="(14, 3)" name="weight_net" attrs="{'readonly':[('type','=','service')]}"/>
</group>
Надеюсь, это вам поможет!