Primary Key Generation with MySQL and EOF?

I think I have tracked down the problem (that was causing the problem 
with horizontal inheritance).  Primary key's don't seem to be getting 
set correctly when using the latest MySQL and WebObjects.

EOF creates the eo_pk_table ok and tracks the primary key values ok, 
but when it writes new records to tables, EOF doesn't seem to write the 
primary key value.

Hence, all primary key values are set to 0, or at least the first one 
is, the second attempt to add a new row fails because the primary key 
is the same.

This is the sort of error I am getting:

  com.webobjects.eoaccess.EOGeneralAdaptorException: EvaluateExpression 
failed: <com.webobjects.jdbcadaptor.MySQLPlugIn$MySQLExpression: 
"INSERT INTO sdclient(sdcountry, sdemailaddress, sdstreetaddress, 
sdfaxnumber, sdphonenumber, sdclientcode, sdpostaladdress, sdname, 
sdpostcode, sdstate) VALUES (NULL, NULL, ?, NULL, NULL, ?, NULL, ?, 
NULL, NULL)" withBindings: 1:"B"(streetAddress), 2:"B"(clientCode), 
3:"B"(name)>:
     Next exception:SQL State:S1009 -- error code: 1062 -- msg: Invalid 
argument value,  message from server: "Duplicate entry '0' for key 1"

Note, EOF does not seem to be writing the column "sdclientpk" even 
though it is a part of the model, and it is set at the primary key for 
that table.

Any ideas, suggestions, obvious errors, most appreciated.

Cheers,
Ashley.