We are experiencing some problems with attributes mapping such as the ones you have experienced. I only assume you are using the attributes mapping because you say it reflects on the generated code. I will advice you to switch to xml mapping and see if in runtime the correct settings are used.
I would like to ask you for a sample project showing this behaviour so that we can further investigate it locally as we cannot exactly pinpoint the problems at the moment.
I hope this is helpful and please do not hesitate to let us know if you face further trouble.
the Telerik team
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