If you create a column set, then drag it to a devices group, the specified data by the selected column set in the right pane of the Network View does not appear.
For example if you want to get the value of Days Since Last Updated by Inventory Server, you'd find the specified data is empty, no any value appear
This would affect all the values like Days Since Last X
1, Go to Data Analytics--Data Translation Services--Calculate Data--All Rules
2, Right click the value from name list , then click Run now
3, Start the operation
4, After the operation complete, refresh the Network View, the specified value would appear automatically