We are aware of this problem. We are currently concentrating our efforts on providing Forward mapping capabilities via the domain model designer and this problem will not be there.
As a workaround for you I would suggest that you specify the following mapping for your field, in the app.config file
<extension key="dependent" value="true" />
Also if you specify a FetchGroup using the 'FetchField' attribute you can instruct the Forward mapping wizard to write the mapping to the xml file instead of adding attributes in code. This can be done via the 'Telerik->OpenAccess->Options' dialog.
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