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Commodities cannot be measured using unit of measure
**Affects:** SAREF **Situation:** SAREF contains the axiom: `subClassOf(Commodity AllValuesFrom( isMeasuredIn UnitOfMeasure )`. However, examples of commodities like Water or Electricity cannot be measured using any unit of measure. isMeasuredIn should only be used for Measurements **Proposal:** to delete the axiom **Status:** agreed during SmartM2M-3rd RG Meeting about 2 NWIs SAREFv3 and SAREF Com Framework V2 2019-05-09
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