Why Range and Ratio inconsistent?

• Quantity, Range, Ratio, string @ SubstanceDefinition.relationship.amount[x]
  * Quantity, Range, string @ SubstanceAmount.amount[x]
  * Quantity, Range, string @ SubstanceReferenceInformation.target.amount[x]
  * Quantity, string @ SubstanceDefinition.moiety.amount[x]
  * Quantity, string @ SubstanceDefinition.property.amount[x]

Given that amountType allows for a Ratio, it would appear to be justified here. BR&R should review the other choice lists for consistency too