I have for example an entity. With the following properties:

```
public class Entity
{
   public int CustomerId { get; set; }
   public Customer { get; set; } 
}

```

How can I map the CustomerId twice. Once for the int property and once for the many-to-one relationship ?

```
<many-to-one name="Customer" column="[CustomerId]" class="Customer"/>
<property name="CustomerId" column="[CustomerId]" type="Int64" />

```

Just this, doesn't work. I've already tried, making them readonly but no success.