NULL values and Data Control based on Web Service

One of my ADF control is based on a Data Control created through a web service. Every thing is working fine except the way ADF control is handling the null values return by the web service based data control.
For example for null columns the web service is sending the following:
<ns0:beginDate xsi:nil="1"/>
or
<ns0:sourceCode xsi:nil="1"/>
But the corresponding column in my ADF data control is trying to initialize itself using the value [{nil=1}]. It fails with the following error.
2006-04-20 13:31:37.510 WARNING JBO-25009: Cannot create an object of type:java.util.Date with value:[{nil=1}]
I will appreciate if someone could help me resolve this issue.
Thanks,

I tried again, but it seems that I'm unable to reproduce this in a test project which uses another data controls but is still as similar as possible to the original project in which I've encountered this behaviour.
However, using a data control based on the same web service as in the original project, [{nil=1}] appears again instead of emtpy values.
Is it possible that there is a significant difference in the generated wrapper classes? The underlying PL/SQL is the same (in strucutre) and the corresponding elements in the response XML of the web service are the same in the two cases, always like <ns0:someResponeValue xsi:nil="1"/>, so I don't know how it is possible that I can't reproduce this behaviour.
A short description of the projects:
Services/Model:
I created a PL/SQL funcition in a package that returns a user type object. This return parameter consists of a non-empty string and a null value string. On top of this I created a PL/SQL web service and a data control for that.
View/Controller:
A JSF JSP page which has a read-only form showing the return values of the web service.
Regards,
Patrik

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