When I executed a XOG, I get this error message: 

XOG-9060: The system cannot import this instance with the current Configuration. Increase the ‘Maximum XML Nodes’ value in the Clarity System Administration and try again.

The XOG file has more nodes that was configure in Maximum XML Nodes 

Release: All Supported Releases
Component: Clarity PPM

• On Premise customers: Change Maximum XML Nodes from 150,000 to 200,000, for example.
  • Note: It's not recommended to change this value to a higher number as it can cause performance issues
  • See the following KB below on how to change governor limits: kb000009826​
• Instead - it's recommend to use the resolution in KB: 100912
  
  
  

See KB 141061 - How to search for known Clarity PPM Issues using Self Service