I have 2 related tables:

*** database tables
account_header
- account_id (PK)
- account_desc


account_details
- account_id (FK)
- amount
- transaction_date

*** Entity Class

@Entity
public class AccountHeader {
@id
int id;
String account_desc;

//getters and setters
}

@Entity
public class AccountDetails {

double amount;
Date transaction_date;

//getters and setters
}

I have encountered an error that an entity should have an id.
How can map this two entities with one-to-many relationship without having a primary key in AccountDetails entity?
I have read in some forums that jpa doesnt support an entity without primary key, is that true?
if so, is there any way to fix my problem?

Thanks in advance :)