Legacy Mapping Problem: Compound PK is Foreign Key

Question

My job is to map beans using JPA onto a legacy database schema that must not get modified. I am stuck with doing the relation between two tables.
The schema is:
CREATE TABLE A (
     a1 INTEGER NOT NULL,
     a2 INTEGER NOT NULL,
     PRIMARY KEY (a1, a2)
CREATE TABLE B (
     b1 INTEGER NOT NULL,
     b2 INTEGER NOT NULL,
     b3 INTEGER NOT NULL,
     FOREIGN KEY f (b1, b2) REFERENCES A (a1, b2) ON UPDATE CASCADE ON DELETE CASCADE,
     PRIMARY KEY (b1, b2, b3)
)As you can see, both tables have compound primary keys, and the primary key of table B contains a foreign key to table A. This is typical in our DB because B in fact acts like a "inner table" (in the sense of "inner class") to A.
So far I defined both classes and provided a primary key, but the question now is, how to provide the relation between both? The relation shall be unidirectional, so that I can query all Bs belonging to one A by "myA.getBs(): Collection".
The code I have written so far is:
@Entity
public class A {
     @EmbeddedId
     private APK primaryKey;
     @OneToMany
     private Collection<B> characteristics;
@Embeddable
public class APK {
     private String a1;
     private String a2;
@Entity
public class B {
     @EmbeddedId
     private BPK primaryKey;
@Embeddable
public class BPK {
     private String b1;
     private String b2;
     private String b3;
}Unfortunately that is not working, because the JPA Provider (here: TopLink Essentials) tries to map the relationship on a third table named "A_B" that actually is not there.
So how to tell TopLink to find the mapping information in table B (just like using the foreign key f)?
Please help, I am driving nuts!

Answer 1

OK
So i found out the real problem
And the problem is that my CustomerHistory has a Text Field, as in a MS SQL Server TEXT Field
When i changed it to a VARCHAR, it started working
The strangest thing is that Customer also has a TEXT Field (mapped to a String) and i can do Finds without any problems
So my question now is how can i work with TEXT in CMPs ?
Thanks