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You are correct. If you move an element to a new parent, the displays will show "Attribute Not Found" errors. This is because technically, the element is no longer the same and is considered a brand new element.
If this element occurs on 1 display, you will need to recreate the objects with the data item path pointed to the new element path.
If this element is found in a lot of displays, I'd recommend that you contact OSIsoft Tech Support. We have internal scripts that will assist you on correcting your displays.
Welcome to the world of using strings to define paths...
I do most of my work on a development system and frequently have to rearrange things to try out new ideas or because I an analysis only works with a different style hierarchy... I use the asset context fields to let PI Vision find information for me whenever possible so I can restructure the AF hierarchy without breaking everything...
I recently changed the name of a template with the expectation I would have to modify the template name in my asset selection fields in PI Vision... Imagine my surprise when I checked the PI Vision display and the template names were already changed