IfcConstructionResource omitted BaseQuantity means costs are total?

[Andrej730]

In IfcCostItem.CostValues it says that if CostQuantities are not provided then values indicate total costs.
https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcCostItem.htm

IfcConstructionResource also has the values and quantities and both can be omitted to but it doesn't explicitly say that omitted quantities mean that costs are total and costs are described as "unit costs".
Does it mean shouldn't be treated as a total cost if quantity is omitted or it's just an overlook of the documentation?