Exception raised using JComboBox with JUComboBoxBinding in a JTable

Hello,
I am using JDeveloper 9.0.3.1035.
I have a JTable bound to a bc4j view object. Now I want to use a JComboBox to select the value for a foreign key column in that Table. For this I have followed the HOWTO posted by Arno van der Kolk in Thread JClient - JTable and JComboBox which extends the OTN example "How to Add a JComboBox to a Cell in a JTable". This almost works fine except for one thing:
In the the ComboBox I display a String value but the view attribute is of type Number. Now when I edit the column using the ComboBox and the value of the selected entry cannot be converted to Number I get an exception like the following:
oracle.jbo.domain.DataCreationException: JBO-25009: Cannot create an object of type:oracle.jbo.domain.Number with value:030522 001
Even after this exception is raised the database record is updated with the correct number value corresponding to the selected entry when the changes are commited. The only w/a I have found so far is to display the foreign key attribute as the first column of the JComboBox but this is not what I want. This behaviour also occurs using the aforementioned OTN example with my JDev version but the sample works with JDev 9.0.2.
How can I get this to work using JDev 9.0.3?
Any help is greatly appreciated.
Regards,
Christof Breker

The Thread I was really referring to is:
[JClient] HOWTO: Using databound comboboxes (for foreign keys) in a JTable
The OTN sample can be found under:
http://otn.oracle.com/sample_code/products/jdev/jclient/jclient_table_combo_sample.html

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