Ignoring a entity property with FluentNHibernate?

Question

I'm trying ignore a entity property but I cannot do it. Looking for some how to do this, I found some examples but still can't do. How could I do this ?

trying

public class Caixa {

        public virtual long id                      { set; get; }
        public virtual DateTime dtOcorrencia        { set; get; }
        public virtual String historico             { set; get; }
        public virtual int tipoOcorrencia           { set; get; } //1 entrada, 2 saida
        public virtual decimal valorOcorrencia      { set; get; }
        public virtual FormaPagamento formaPagto    { set; get; }

        //should be ignored 
        public IList<Caixa> report = new List<Caixa>();

        public Caixa () {
        }

        public IList<Caixa> getReport() {
            return report;
        }

    }

Map

public class CaixaMap : ClassMap<Caixa> {
        public CaixaMap() {
            Table("CAIXA");
            Id(c => c.id).GeneratedBy.Native();
            Map(c => c.dtOcorrencia).CustomType<DateTime>();
            Map(c => c.historico);
            Map(c => c.tipoOcorrencia).CustomType<int>();
            Map(c => c.valorOcorrencia).CustomType<decimal>().Precision(15).Scale(2);            
            Map(c => c.formaPagto).CustomType<GenericEnumMapper<FormaPagamento>>();
            Map(c => c.report); //ignore it

        }
    }