Mapping overrides not being picked up

Hi,

In my Fluently.Configure statement I'm using AutoMappings and I am using
.UseOverridesFrom AssemblyOf<PropertyMappingOverride>() The PropertyMappingOverride class is defined in the same assembly as this statement and is recognized by Intellisense.

I have two overrides currently defined in two different files:

namespace QuotesApp.MappingOverrides
{

class PropertyMappingOverride : IAutoMappingOverride<Property>
{
    public void Override(AutoMapping<Property> mapping)
    {
        mapping.HasMany<AssessedItem>(x => x.AssessedItems).Inverse().AsBag();
    }
}

}

namespace QuotesApp.MappingOverrides
{

class AssessedItemMappingOverride : IAutoMappingOverride<AssessedItem>
{
    public void Override(AutoMapping<AssessedItem> mapping)
    {
        mapping.References<Property>(x => x.Property).Not.Nullable();
        mapping.Map(x => x.PropertyClassification).Length(50);
    }
}

}

I have tried putting breakpoints in both of these methods, but they never get hit. I even tried throwing an exception in the overrides, but they seem to be completely ignored. I confirmed this by comparing the hbm files generated with and without the overrides. No difference. Is there something else I need to do?

Here is the complete configuration statement:

        return Fluently.Configure() 
            .Database(persistenceConfigurer) 
            .Mappings(m => m.AutoMappings.Add( 
                               model.AddEntityAssembly(typeof(EntityBase).Assembly) 
                               .IgnoreBase<EntityBase>()
                               .IncludeBase<AssessedItem>()
                               .IncludeBase<Location>()
                               .Where(t => t.Namespace.EndsWith("DomainModel")) 
                               .Conventions.Add<MyIdConvention>()               
                               .Conventions.Add<ReferenceForeignKeyConstraintConvention>()
                               .Conventions.Add<HasManyForeignKeyConstraintConvention>()  
                               .Conventions.Add(ForeignKey.EndsWith("ID"), PrimaryKey.Name.Is(x => "ID"))
                               .Setup(s => {s.SubclassStrategy = t => SubclassStrategy.JoinedSubclass;})
                               .Override<Location>(map => { map.Not.LazyLoad(); })
                               .Override<DlsLocation>(map => { map.IgnoreProperty(x => x.DisplayString); })
                               .Override<DlsLocation>(map => { map.IgnoreProperty(x => x.SortingString); })
                               .UseOverridesFromAssemblyOf<PropertyMappingOverride>()
                               ).ExportTo("C:\\Temp\\hbm")) 
            .ExposeConfiguration(BuildSchema) 
            .BuildSessionFactory();