Allow the use of @GeneratedValue even if column is not primary key

I have an entity class SupplierOrder.java which contains two fields: cuId and orderId

@Data
@EqualsAndHashCode(callSuper = false, of = { "cuId" })
@Builder(toBuilder = true)
@AllArgsConstructor
@Entity
@Table(name = "supplier_order")
public class SupplierOrder
{
        @Column(name = "cuid", nullable = false)
        private Long cuId;
    
        @Id
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "supOrd")
        @SequenceGenerator(name = "supOrd", sequenceName = "supplier_order_seq", allocationSize = 1 )
        @Column(name = "order_id", nullable = false)
        private Integer orderId;
}

When I save my entity the following operation on the database used to undertake

1. select next value for supplier_order_seq
2. insert into supplier_order(cuid,order_id)values(101,"<value from the point 1>")

Now, I have to flip the primary key. In other words, cuid becomes my new primary key and the rest remains the same.

@Data
@EqualsAndHashCode(callSuper = false, of = { "orderId" })
@Builder(toBuilder = true)
@AllArgsConstructor
@Entity
@Table(name = "supplier_order")
public class SupplierOrder
{
        @Id                  //changed primary key from orderId to cuid
        @Column(name = "cuid", nullable = false)
        private Long cuId;
    
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "supOrd")
        @SequenceGenerator(name = "supOrd", sequenceName = "supplier_order_seq", allocationSize = 1 )
        @Column(name = "order_id", nullable = false)
        private Integer orderId;
}

Now, when I am trying to save my entity the following operations happen:

1. insert into supplier_order(cuid,order_id)values(101,NULL)

Note: getting next value from the seq supplier_order_seq does not happen and because of this, it is giving me error as I cannot save order_id as null. How do I make sure that order_id value should be provided by seq supplier_order_seq even after changing the primary key?

I have tried referring multiple solutions from the link below but none of them worked.

• https://github.com/eclipse-ee4j/jpa-api/issues/113