The 'Swap with another node' function in the administration interface swaps two nodes (not subtrees).
When one of the objects (A) is a container, with children, and the other (B) is not, the result will be an incoherent state:
B will display a children count such as " Sub items ", but instead of the children will show the message "The <ClassName> class is not configured to contain any sub items."
- Create or modify a class, and uncheck the "Container" checkbox.
- Create a new object of this type (NodeA)
- Create a Folder object (NodeB), and add at least one child node to it.
- Swap NodeA with NodeB using the node's cogwheel > Advanced > Swap with another node.
Verify that NodeA should not have any children (not container) but does display a Sub Item count.
Its possible the same issue may be triggered from a script, for example; in which case the solution should ideally contemplate it as well.