foriegn key is not set in saveOrUpdate

[ho ihu]

Deat friends

Fluent Nhibernate is not setting the value of foriegn key in children table, is there anyone to write the reason ?

My code:

    public class StoreMapping : ClassMap<StoreModel>
    {
        public AcademicBooksMapping()
        {
            Table("Store");
            Id(u => u.Id);
            Map(u => u.name).Nullable();

HasMany(x => x.Books).Not.KeyNullable().KeyColumn("StoreId").Inverse().Cascade.All().Not.LazyLoad();

            }

        }

    public class BooksMapping : ClassMap<BookModel>
    {
        public BooksMapping()
        {
            Table("Book");
            Id(u => u.Id);
            Map(u => u.name).Nullable();

           References(x => x.Profile).Column("StoreId").Cascade.SaveUpdate().Not.LazyLoad();

            }

        }

StoreId is null en every save