FluentNhibernate Intermediary Table

Question

If we consider this example

But now quantity is a Value Object instead of a primitive type:

public class LineItem { public Quantity Quantity { get; set; } public Product Product { get; set; } }

instead of:

public class LineItem { public int Quantity { get; set; } public Product Product { get; set; } }

how could i map this:

    HasMany<LineItem>(x => x.LineItems)
        .Component(c =>
            {
                **c.Map(x => x.Quantity);**
                c.References<Product>(x => x.Product);
            }).AsList();

considering that fluentnhibernate doesn't accept this:

    HasMany<LineItem>(x => x.LineItems)
        .Component(c =>
            {
                **c.Component(x => x.Quantity...);**
                c.References<Product>(x => x.Product);
            }).AsList();

thanks