I try to use $expand parameter in view xml but combobox doesn't display data 

[![enter image description here](https://i.stack.imgur.com/NLwBD.png)](https://i.stack.imgur.com/NLwBD.png)

```
        <Text text="ID_PLANNING"/>
        <ComboBox items="{path :'/T027_03s', parameters:{expand : 'T027Details'}}">
            <core:Item text="{T027Details/BEG_DATETIME}"/>
        </ComboBox>

```

When $expand T027Details from T027\_03s table, the link ..../T027\_03s?$expand=T027Details

[![enter image description here](https://i.stack.imgur.com/erD7N.png)](https://i.stack.imgur.com/erD7N.png)

Here is $metadata for T027\_03 table with navigation property: T027Details

[![enter image description here](https://i.stack.imgur.com/p4bkm.png)](https://i.stack.imgur.com/p4bkm.png)

Here is my code of creation entity in Java

> 
> @Entity
>  public class T027\_03 implements Serializable {
> 
> 
> 

```
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="SEQ_T027_03")  
private Long ID_PERSONNEL_PLANNING;
private Integer ID_PERSONNEL;
private Long ID_PLANNING;
private static final long serialVersionUID = 1L;
[...]
@ManyToOne
@PrimaryKeyJoinColumn(name="ID_PLANNING")
private T027 T027;

public T027 getT027() {
    return this.T027;
}
public void setT027(T027 T027) {
    this.T027 = T027;
}
[...]
} 

```

And in classe T027

> 
> @Entity
>  public class T027 implements Serializable {
> 
> 
> 

```
@Id 
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="SEQ_T027")
private Long ID_PLANNING;
private Timestamp BEG_DATETIME;
[...]
private static final long serialVersionUID = 1L;

@OneToMany(mappedBy="T027")
private List<T027_03> T027_03S;

public List<T027_03> getT027_03S() {
    return this.T027_03S;
}
public void setT027_03S(List<T027_03> T027_03S) {
    this.T027_03S = T027_03S;
}

```

I have seen the same question [OData Model Not Working](https://stackoverflow.com/questions/48495687/odata-model-not-working) but I don't know how to resolve it. Their reponse is to add "RESULT".. . but how I can add 'RESULT' ?