I know it works in v2017 PU2; but now I see you are asking about v2014. sorry.
When I import into CI_Item, and it is creating new part numbers, it updates the ""Created by"" Date and Time, but NOT the ""Updated By"" date and time.
When I import into CI_Item again, and I modify a field, it updates the ""Updated by"" date and Time. Using the User from the VI Job; and the time stamp the job was run.