In 'Settings> All Settings> NS> Resource and Data Class Settings> Resource Types> Contract Types > Contract', you added the 'Cost Center Ownership' data class under the Data Classes.
Then in 'Home> Service and Asset Management> Contracts, you selected one of the contracts, right-clicked and in the Edit page under 'Cost and Ownership', added and saved the cost center and it gives an error.
Asset Management Solution 8.1 and higher
We removed this functionality to avoid performance issues in versions prior to 8.1.
To work around this, do the following: