Contragents        Types
id guid            id guid
type_id guid       name string
name string

class Type
{
     public virtual Guid Id {get; protected set; }
     public virtual string Name {get;set;}
}

class Contragent
{
     public virtual Guid Id {get; protected set; }
     public virtual string Name {get;set;}
     [color=red]public virtual Type CtrType {get;set;}[/color]
}

<many-to-one
        name="CtrType"                                
        column="type_id"                               
        class="Type"                                  
        cascade="all"              
        fetch="select"                                
        update="false"                               
        insert="false"                                
        property-ref="Id"
        access="property"       
        unique="false"                               
        optimistic-lock="true"                    
        not-found="ignore"  />