DataFlow Incremental Refresh

The setup seems good to me.

"refreshing the table using Replace method works fine."

Are you saying this exactly same dataflow runs successfully if you choose Replace method, it only fails if you choose Append method?

So your M code is exactly the same in both cases. The only change is the destination settings?

So the issue seems to be related to the destination settings?

However, using Replace method will erase all the old data so you don't want to use it in your case. You want to Append to keep the old data and add new data.

Btw, I see there are a couple of known issues with Data Factory <> Oracle.

https://learn.microsoft.com/en-us/fabric/get-started/fabric-known-issues

Could the issue be relates to the number format? Could you try to force the number format to whole number (Int64)?

(Please do the testing in a test workspace in your Fabric, not production workspace.)

Tbh I'm confused why you are getting an error.

Just to make sure, the IncrementalEventID query has disabled staging, and this query does not have a destination, right?

Perhaps you could create a support ticket to have the support team look at the case.