CMP2.0 (CMR one-to-one,unidirect) question

[xml ns]

Hello!

I use jdk1.3.1_02 and j2eesdk1.3.1 RI.
I have two CMP2.0 (Local) EnityBeans A and B.

           1        1
  A       <----------     B
 ___                     ___

 pId (PK)                bId (PK)

public abstract class ABean implements EntityBean
{
  private EntityContext context;

  // Access methods for persistent fields

    public abstract String getAId();
    public abstract void setAId(String aId);
.....
}

public abstract class BBean implements EntityBean
{
  private EntityContext context;

  // Access methods for persistent fields

    public abstract String getBId();
    public abstract void setBId(String bId);
......

  // Access methods for relationship fields

    public abstract LocalA getA();
    public abstract void setA(LocalA a);
.....
}

Relation is 1:1, unidirectional.
Database is cloudscape.

Container create two tables "ABeanTable" and "BBeanTable".

"ABeanTable" contains field "__reverse_a_bId", and
"BBeanTable" contains field "_a_aId".

What for they are necessary in my (!) tables?

Thanks in advance.
Dron.

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