HasOne vs References Mapping Fluent NHibernate

This is the first time I am working with FluentNhibernate Mapping and facing a question of how to reference another table. Any help is appreciated: I have several tables named CD_varname and all these contain two columns - CODE and DESCR. I have one main table called Recipient and it has, say two columns, called ALIVE and SEX, both are of type number, and they reference to the tables CD_ALIVE and CD_SEX. If Alive=1 in the Recipient, then we need to get the code and descr from CD_ALIVE table where Code=1. I have described a Codef class: ``` public Class Codef { int Code { get; set; } string Descr { get; set; } } ``` My Recipient Class assigns these to a component. Recipient class looks like this: ``` public Class IRecepient { int ID { get; set; } Birth Birth {get; set;} Death Death { get; set; } } ``` Where my Birth and Death classes are: ``` public Class Birth { DateTime BDate { get; set; } Codef Sex { get; set; } Codef Ethnicity { get; set; } //CD_ETHNICITy Table Codef Race { get; set; } //CD_RACE Table } ``` and my Death Class: ``` public Class Death { DateTime DeathDate { get; set; } Codef Alive { get; set; } } ``` so, the main column "Alive" in Recipient is actually referencing my Recipient.Death.Alive.Code I Have a codef mapping class: ``` public CodefMapping() { Map(x => x.Code, "CODE"); Map(x => x.Descr, "DESCR"); } ``` I am trying to do the recipient mapping and this is where I am stuck. Can I do something like this: ``` HasOne<CodefMapping>(c => c.Death.Alive) .PropertyRef(c => c.Code) .PropertyRef(c => c.Descr) .WithForeignKey("ALIVE"); ``` It is not working :( Any help is greatly appreciated. Thank you.