Quality of Log Configuration
One of the Tag demonstrating its quality in 800XA 6.0.3 log configuration as "Uncertain, Engineering Unit Exceeded" for one point. The IO value doesn't exceed the limit.
What will be the cause for this quality.
What is your choice of historian?
What is your choice of source OPC server?
With Basic History, most quality codes are set by the OPC server and hence you should turn your focus to the server, not the log.
Can you see this quality code if you use "Subscribe for live data" at the Control Connection aspect?
Is any client application trying to write the value to this tag? If this client application is trying to write a value outside the tag's configured range, 'Uncertain / Engineering Units Exceeded' OPC quality is expected.
If this doesn't help, would request you to contact your Regional Support Center for assistance.