TFS TF212018 - Importing WIT Error

I was trying to import updated templates for Portfolio Backlogs and ran in to this error:

TF212018: Work item tracking schema validation error: TF26177: The field System.
IterationId cannot be renamed from 'IterationID' to 'Iteration ID'.

It appears some of the fields between versions of TFS have changed.  If you open the XML file you are trying to import, find the problematic fields, then rename them accordingly the import will succeed as planned.

You may get several of these as you go through the import process.  Simply work through them, then the import will eventually go.

witadmin importwitd /collection:https://tfs.lexisnexis.com/tfs/TFS-DAY /p:"Lexis Diligence" /f:"
C:\temp\Microsoft Visual Studio Scrum 2013.4\WorkItem Tracking\TypeDefinitions\S
haredParameter.xml"
The work item type import has completed.

I would guess this originates from our recent upgrade to TFS 2013 from TFS 2012.