if you try to sort the Inventory by the column "Discovered" or "Devicetype" you get German translated Operator Console error message "Data Access Error":
In German the column identifiers are translated:
Discovered -> Erkannt
Devidetype -> Gerätetyp
In the Developer Console of Chrome you can see, that the German identifier is the issue:
the problem seems to affect all other languages than english.
UIM/OC 20.4 CU9 or lower
Code defect
Download and deploy the ump_operatorconsole-20.6.1-T2 to your OC system.