list_parent_id_field
The name of the field in the working list that will contain the identifier of the parent of the tree item. This is only valid for unlevelled lists and will be ignored if listtype is "levelled".
Default value
Blank. If left blank, all items will be assumed to be top level items.
Valid values
The name of the field in the working list that will contain the identifier of the parent of the tree item.