RowFilter: Problem using child-relation

Hi,

I have a DataSet containing the the tables "Publication" and "Copy"

There is a DataRelation between Publication (parent) and Copy (child)
called "Publication_Copy" - I tested that it's working fine.

Now I want to be able to filter the Publication-rows to be displayed
based upon a value in the Copy-table. The following will not work:


.....RowFilter = "Child(Publication_Copy).LocationID=1";


I get a System.Data.SyntaxErrorException for doing that.
Is there a way to do it?


Regards,
Lorenz