@PersistenceCapable(identityType = IdentityType.APPLICATION)

public class InvoiceBase {

@PrimaryKey

@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)

private Key key;

@Persistent

private long invoiceId;

@Persistent(mappedBy = "invoiceBase")

public List<Invoice> invoiceList;

・・・

}

@PersistenceCapable(identityType = IdentityType.APPLICATION)

public class Invoice {

@PrimaryKey

@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)

private Key key;

@Persistent

// アプリによる楽観的ロック用

public long revision;

@Persistent

private InvoiceBase invoiceBase;

@Persistent

public long id;

・・・

}