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Summary
Configuration Items are not visable in Central after upgrading from v10.80 to 2018.05
Question
After upgrading from v10.80 to v2018.05 the Configuration Items in Central are not visible. I am not able to see the drop downs for group aliases, system accounts, or system properties.
Answer
Run the API call https://<server>:8443/oo/rest/latest/config-items/tree when you received the answer, check which ID's have N/A and remove them from the DB.