Why do I get “ parent key not found ”

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C#

NHibernate

HI is there any reason why I get this error. I really searched this site before posting this question. I commented out some of my earlier tries.

What I implemented is Many to One connection. So, PersonAccount has a BankId column (FK), while Bank knows nothing about PersonAccount. There is FK constraint implemented on database level.

public BankMap()
        {
            Table("Bank");
            Not.LazyLoad();
            Id(x => x.Id).Column("BankId").GeneratedBy.Sequence("BANK_SEQ");
            Map(x => x.BankName);
            HasMany(x => x.PersonAccounts).KeyColumn("BANKID").Cascade.All();

            //HasMany(x => x.PersonAccounts).KeyColumn("BANKID").Cascade.All().Inverse();
            //HasMany(x => x.PersonAccounts).KeyColumn("BANKID").Cascade.All().None();
       //     HasMany(x => x.PersonAccounts)
       //.Cascade.AllDeleteOrphan()
       //.KeyColumn("BANKID");

        }

public PersonAccountMap()
        {
            Table("PersonAccounts");
            Not.LazyLoad();
            Id(x => x.Id).Column("AccountId").GeneratedBy.Sequence("PERSONACCOUNTS_SEQ");
            Map(x=>x.PersonName);
            References(x => x.Bank, "BANKID");

            //References(x => x.Person, "PERSONID").Cascade.None();

        }

Hope you'll be able to help me.

Thanks