Q:

Duplicate Display Name error - Dynamics CRM import

I'm importing to CRM using a Data Map from CSV files but I've come up against an error:

There are two columns in Microsoft Dynamics CRM with the same display
  name. Change the display name for one of the columns in Microsoft
  Dynamics CRM before importing.

Having fixed a few actual duplicates, the only remaining duplicate I can find is for timezoneruleversionnumber and utcconversiontimezonecode which both have empty display names and are both system fields (so they're uneditable).
Does anyone have a workaround or a solution for me?

Also, probably not relevant, but this import worked last week when it was being done by our CRM expert (uncontactable) so whether he has a work-around or if the fields were added since (possibly automatically) is a mystery.
I've found a few posts on the net where other people are having the same issue (here) but these all seem to be unresolved.

A:

It turns out there were duplicates between the 1:N attributes and normal attributes which is now fixed, duplicate (empty) names in system fields will not prevent an import.

