**Affects:** SAREF **Situation:** from the definitions of relatesToMeasurement and relatesToProperty, it should be clear that these two properties are inverse one of another. - saref:relatesToMeasurement - A relationship between a property and the measurements it relates to - saref:relatesToProperty - A relationship between a measurement and the property it relates to **Proposal:** Add the axiom: `inverseOf( saref:relatesToMeasurement saref:relatesToProperty )`. **Status:** agreed during SmartM2M-RG Meeting about 2 NWIs SAREFv3 and SAREF Com Framework V2 2019-04-08