"Custom state is not mapped to any state bucket error. Please contact system administrator to verify the setup" error on project table in London
This is caused due to a OOB business rule "Validate state mapped to bucket " which comes with London.
Validate state mapped to the bucket.
This business rule is checking the states and if there are any custom state, this BR is failing and aborting the action.
We will have to add the dictionary override for the state column with the state attributes adding the custom state values.