@Entity
public class Coupon implements Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Integer id;
	
	@OneToMany(fetch = FetchType.LAZY, mappedBy = "coupon", cascade={CascadeType.PERSIST, CascadeType.MERGE})
	private List<Encasement> facEncaissements = new ArrayList<Encasement>(0);

	@Formula("(SELECT DISTINCT TOP 1 e.ChequeNumber FROM Encasement e WHERE e.IdCoupon = Id)")
	private String chequeNumber;

/// Getters & Setters ...
}

@Entity
public class Encasement implements Serializable {
	private static final long serialVersionUID = 1L;
	
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Integer id;

	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "IdCoupon")
	private Coupon coupon;

	private String chequeNumber;

/// Getters & Setters ...
}

select
    distinct coupon 
from
    coupon Coupon   
left join
    coupon.encasements as encasement 
order by
    coupon.chequeNumber asc

select
    distinct TOP(?) coupon0_.Id as Id10_,
    (SELECT
        TOP 1 e.ChequeNumber 
    FROM
        Encasement e 
    WHERE
        e.IdCoupon = coupon0_.Id) as formula0_
from
    Coupon coupon0_ 
left outer join
    Encasement encasement1_ 
        on coupon0_.Id=encasement1_.IdCoupon 
order by
    (SELECT
        TOP 1 e.ChequeNumber 
    FROM
        Encasement e 
    WHERE
        efe.IdCoupon = coupon0_.Id) asc

select
    distinct TOP(?) coupon0_.Id as Id10_,
    (SELECT
        TOP 1 e.ChequeNumber 
    FROM
        Encasement e 
    WHERE
        e.IdCoupon = coupon0_.Id) as formula0_
from
    Coupon coupon0_ 
left outer join
    Encasement encasement1_ 
        on coupon0_.Id=encasement1_.IdCoupon 
order by formula0_ asc