Error iuc4ObjectSheetProvider$pbryglu when editing a User Object

Document ID : KB000094886
Last Modified Date : 04/06/2018
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If a User Object from a client not 0 is opened in client 0 for editing, the tab User is missing. Instead, a tab with name iuc4ObjectSheetProvider$pbryglu and a warning icon is displayed:
User-added image

Trying to open this tab, an error is shown:
User-added image
The root cause is still under investigation by CA development.
Workaround: Open the User Object in its own client.