You cannot modify the factor of UOM "%(uom)s". You cannot modify the rate of UOM "%(uom)s". You cannot modify the category of UOM "%(uom)s". If the UOM is still not used, you can delete it otherwise you can deactivate it and create a new one. Incompatible factor and rate values on UOM "%(uom)s". Rate and factor can not be both equal to zero.