PREREQUISITES:

Two non-container content items and one container content item with children

STEPS:

1. Go to Content > Content Structure > non-container CI
2. Go to Locations tab and click Swap locations
3. Try to select the second non-container content item

ACTUAL RESULT:

In UDW there is still blocked non-container object instead of containers with children.

EXPECTED RESULT:

You cannot select containers with children in UDW. But it should be possible to select non-containers.