CriteriaQuery, @StaticMetamodel and @EmbeddedId?

I hope this is the right forum - please let me know if it isn't.

I am having some trouble with CriteriaQuery - I have a table with a primary key that is composed of three columns; I have created an entity class:

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public class ItemDescr implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
protected ItemDescrPK itemDescrPK;
...

@Embeddable
public class ItemDescrPK implements Serializable {
@Basic(optional = false)
@NotNull
@Column(name = "itemid")
private int itemid;
@Basic(optional = false)
@NotNull
@Column(name = "atid")
private int atid;
...

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And the corresponding @StaticMetamodel classes:

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@StaticMetamodel(ItemDescr.class)
public class ItemDescr_ {

public static volatile SingularAttribute ivalue;
public static volatile SingularAttribute itemDescrPK;
...

@StaticMetamodel(ItemDescrPK.class)
public class ItemDescrPK_ {

public static volatile SingularAttribute atid;
public static volatile SingularAttribute created;
public static volatile SingularAttribute itemid;
...

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I would have thought that I should be able to address *atid* in ItemDescrPK_ like this:

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itd = em.createQuery(
itdq.select(itdr)
.where(
builder.equal(itdr.get(ItemDescr_.itemDescrPK.atid)), ...

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However, it gives a syntax error; or rather, NetBeans marks this as an error, saying:

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cannot find symbol
symbol: variable atid
location: variable itemDescrPK of type SingularAttribute

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Isn't this the way it is supposed to be, then? Or, rather, what is the right way?