How to fix the Oracle error XOQ-00510: NULL key found in hierarchy?

In this post, you’ll learn more about the Oracle ErrorXOQ-00510: NULL key found in hierarchy with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

XOQ-00510: NULL key found in hierarchy

Reason for the Error XOQ-00510: NULL key found in hierarchy

Cause: The hierarchy was not identified as a skip-level hierarchy, although it contained NULL values.

How to fix the Error XOQ-00510: NULL key found in hierarchy ?

You can fix this error in Oracle by following the below steps

Action: Correct the metadata for the hierarchy to mark it as a skip-level hierarchy.