On 2020-12-30 07:48, ken.dickey--- via Cuis-dev wrote: .. > I suspect you need to define #meter. Unit tests are your friend. in MultipliedUnitTest>>setUp BaseUnit named: 'meter' sign: 'm'. So SimpleMeasure amount: 2 unit: (BaseUnit named: 'meter' sign: 'm'). "--> 2 meters " HTH, -KenD