the following query fails:

var results = DetachedCriteria
        .For<OrderLine>
        .SetProjection(Projections
                .ProjectionList()
                .Add(Projections.GroupProperty("item.category"))
                .Add(Projections.GroupProperty("order.sales_date"))
                .Add(Projections.Sum("quantity*item.unit_factor")))
        .CreateAlias("order", "order")
        .CreateAlias("item", "item")
        .CreateAlias("item.category", "category")
        .Add(Restrictions.Between("order.sales_date", start, end))
        .Add(Restrictions.Eq("order.invoiced", true))
        .GetExecutableCriteria(session)
        .List();

with the exception:
could not resolve property: quantity*item.unit_factor of:
SalesReports.Web.Model.Domain.OrderLine

however the following HQL works:

select
    c,
    h.sales_date,
    sum(d.quantity*i.unit_factor)
from
    OrderLine d
    join d.order h
    join d.item i
    join i.category c
where
     h.sales_date between :start and :end
 and h.invoiced = true
group by
     c.id,
     c.sort_order,
     c.name,
     c.parent_category,
     h.sales_date

how do I fix the projection Projections.Sum
("quantity*item.unit_factor")?
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