Lookup for FHIR R2 Quantity for use in FHIR R4

Source ElementUsageTarget
Quantity.idUseOneOfElementsAge.id,Count.id,Distance.id,Duration.id,Money.id,Quantity.id
Quantity.extensionUseOneOfElementsAge.extension,Count.extension,Distance.extension,Duration.extension,Money.extension,Quantity.extension
Quantity.valueUseOneOfElementsAge.value,Count.value,Distance.value,Duration.value,Money.value,Quantity.value
Quantity.comparatorUseOneOfElementsAge.comparator,Count.comparator,Distance.comparator,Duration.comparator,Quantity.comparator
Quantity.unitUseOneOfElementsAge.unit,Count.unit,Distance.unit,Duration.unit,Money.currency,Quantity.unit
Quantity.systemUseOneOfElementsAge.system,Count.system,Distance.system,Duration.system,Quantity.system
Quantity.codeUseOneOfElementsAge.code,Count.code,Distance.code,Duration.code,Money.currency,Quantity.code