ORA-02201：Hibernate @SequenceGenerator不允许使用序列

问：

我收到以下错误：

error performing isolated work; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: error performing isolated work
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:259)
...
...
Caused by: org.hibernate.exception.SQLGrammarException: error performing isolated work
...
...
Caused by: java.sql.SQLSyntaxErrorException: ORA-02201: sequence not allowed here

我有一个这样的实体：

@Entity
@Data
@Table(name = "mytable", schema = "myschema")
@NoArgsConstructor
@AllArgsConstructor
@SequenceGenerator(name="mygenerator", sequenceName = "myschema.myseq",allocationSize = 1)
public class MYENTITY {

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "mygenerator")
private Long id;
}

序列“myseq”存在。

任何线索，为什么我得到错误？

Hibernate方言： spring.jpa.properties.hibernate.dialect=com.asb.anna.web.repository.Oracle12cDialectBugfixImpl