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JPA: incomplete SQL query

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I have a table:

and another table:

with the following constraints:



"Generated" entities look like:


and there are some other entities which i guess (and hope) are of not much value in this context.

I need to create a Job and SubJob in the same application managed transaction.
The JPA entity managers/controller are generated.
Note: managers/controller have been modified so that they dont have to manage transactions.

Here is the code that I have written:

The error stack is:
<openjpa-1.2.1-SNAPSHOT-r422266:707222 fatal store error> org.apache.openjpa.persistence.RollbackException: The transaction has been rolled back. See the nested exceptions for details on the errors that occurred.
at org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:523)
... 38 more
Caused by: <openjpa-1.2.1-SNAPSHOT-r422266:707222 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: Field "entity.SubJob.pk" of "entity.SubJob@577a577a" can not be set to "entity.SubJobPK@84933dcf" value.
at org.apache.openjpa.jdbc.meta.strats.HandlerFieldStrategy.insert(HandlerFieldStrategy.java:131)

The queries printed on the console are:
executing prepstmnt 885994703 INSERT INTO EM.Job (JOB_ID, SUBMITTED_BY, SUBMITTED_TS, JOB_TYPE_ID, STATUS_CD) VALUES (?, ?, ?, ?, ?) [params=(long) 19, (String) shree, (Timestamp) 2009-03-13 19:54:02.125, (long) 1, (long) 1]
[0 ms] spent
executing prepstmnt 1556241602 INSERT INTO EM.SUB_JOB (JOB_ID, JOB_TYPE_ID, STEP_ID) VALUES (?, ?, ?) [params=(long) 19, (null) null, (null) null]
[16 ms] spent

Looks like the insert of SUB_JOB query is generated in correctly/ incompletely!
Can anyone help us in rectifying the problem?

Thanks in advance
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