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I have found that the DataRelation object is a little flaky when it comes to combinations of self-referencing tables and multi-table nested relationships particularly with those that run more than 2 levels deep or have their root level row with the same PrimaryKey as its ForeignKey ParentID. Of course if you are using foreign key constraints you can t just set the ParentID to 0.With this in mind I had to resort to writing a custom solution