No "hierarchical" option in List views for second-level DB?

[Matt_Blais]

I don’t understand why the List view’s “Hierarchical” option for a tree-structured DB is only available if the DB appears at the top level of the List view:

Here the hierarchical option is not available for the same DB when it appears at the second level:

[Chr1sG]

Representing nested relations

Am I correctly interpreting that only top-level types within a hierarchical list are allowed to be recursive? Would it be possible to allow nested types to have recursive relations as well? I’ve got two types, ideas and tasks (it’s sort of a simplified GIST approach). Ideas can have sub-ideas and sub-tasks. Tasks can also have their own sub-tasks. Currently I’ve got a list that shows nested ideas, but I can only make it show the first level of sub-tasks.

Can’t say that it answers the ‘Why?’ though

[Matt_Blais]

In my case (probably the most popular case by far), I am modeling a strict tree structure with the one->many self-relation.

This case at least should not be problematic to support, unless adding a third List View level that might refer back to an already-displayed parent.